when i run this in Dreamweaver (website preview) it works perfectly but as soon as i put it into FTP i got this ...
http://www.infinit0s.cba.pl/tutorial6/mathgame1.html

here is the code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Maths game</title> 
<script language="JavaScript"> 
 
var kNumberOfProblems = 10;
var kTableIdForProblems = "practiceMathTableProblems";
var kTableIdForAnswers = "practiceMathTableAnswers";
var kTableIdForResults = "practiceMathTableResults";
var kMultiplication = 'x';
var kAddition = '+';
var kSubtraction = '-';
var kDivision = '\367';
var kNotAnswered = -1;
var kBiggestOperand = Math.floor(Math.random()*101); 
var points = 0;

var gStartTime = 0;  
var gProblemArray = new Array(); 
function assert(isTrue, message) { if (!isTrue) { alert(message) } }
 
function myPop (string){
   var generator=window.open('',
                             'name',
                             'width=400,height=100,toolbar=0,scrollbars=0,screenX=200,screenY=200,left=200,top=200');
 
   generator.document.write('<html><head><title>Math Challenge!</title></head><body>');   
   generator.document.write(string);
   generator.document.write('<center><a href="javascript:self.close()">Close</a></center>');
   generator.document.write('</body></html>');
   generator.document.close();
}
 
function requestPrintTest(operation){
   if (document.getElementById) {
    
      document.practiceMathForm.problem0.value = '';
      document.practiceMathForm.problem1.value = '';
      document.practiceMathForm.problem2.value = '';      
      document.practiceMathForm.problem3.value = '';
      document.practiceMathForm.problem4.value = '';
      document.practiceMathForm.problem5.value = '';
      document.practiceMathForm.problem6.value = '';
      document.practiceMathForm.problem7.value = '';      
      document.practiceMathForm.problem8.value = '';
      document.practiceMathForm.problem9.value = '';    
                 
      clearChildNodes(kTableIdForProblems);
      clearChildNodes(kTableIdForAnswers);
      clearChildNodes(kTableIdForResults);

      if (navigator.product && navigator.product == "Gecko") {
         setTimeout("printTest("+"'"+operation+"'"+")", 0);
      } 
      else {
         printTest(operation);
      }
   }
   else {
      alert("Sorry, dynamic table feature works with IE5 or later for Windows, and Netscape 6 or later.");
   }  
 
   gStartTime = getCurrentTimeInSeconds();
}
 
function requestPrintResults(){
  
   document.practiceMathForm.finishedButton.disabled=true;
 
   if ('' != document.practiceMathForm.problem0.value)
      gProblemArray[0].theirAnswer = document.practiceMathForm.problem0.value;
   else 
      gProblemArray[0].theirAnswer = kNotAnswered;  
   if ('' != document.practiceMathForm.problem1.value)
      gProblemArray[1].theirAnswer = document.practiceMathForm.problem1.value;
   else 
      gProblemArray[1].theirAnswer = kNotAnswered;  
   if ('' != document.practiceMathForm.problem2.value)
      gProblemArray[2].theirAnswer = document.practiceMathForm.problem2.value;
   else 
      gProblemArray[2].theirAnswer = kNotAnswered;  
   if ('' != document.practiceMathForm.problem3.value)
      gProblemArray[3].theirAnswer = document.practiceMathForm.problem3.value;
   else 
      gProblemArray[3].theirAnswer = kNotAnswered;        
   if ('' != document.practiceMathForm.problem4.value)
      gProblemArray[4].theirAnswer = document.practiceMathForm.problem4.value;
   else 
      gProblemArray[4].theirAnswer = kNotAnswered;  
   if ('' != document.practiceMathForm.problem5.value)
      gProblemArray[5].theirAnswer = document.practiceMathForm.problem5.value;
   else 
      gProblemArray[5].theirAnswer = kNotAnswered;        
   if ('' != document.practiceMathForm.problem6.value)
      gProblemArray[6].theirAnswer = document.practiceMathForm.problem6.value;
   else 
      gProblemArray[6].theirAnswer = kNotAnswered;  
   if ('' != document.practiceMathForm.problem7.value)
      gProblemArray[7].theirAnswer = document.practiceMathForm.problem7.value;
   else 
      gProblemArray[7].theirAnswer = kNotAnswered;        
   if ('' != document.practiceMathForm.problem8.value)
      gProblemArray[8].theirAnswer = document.practiceMathForm.problem8.value;
   else 
      gProblemArray[8].theirAnswer = kNotAnswered;  
   if ('' != document.practiceMathForm.problem9.value)
      gProblemArray[9].theirAnswer = document.practiceMathForm.problem9.value;
   else 
      gProblemArray[9].theirAnswer = kNotAnswered;  
            
   if (document.getElementById) {
      clearChildNodes(kTableIdForAnswers);
      clearChildNodes(kTableIdForResults);
    
      if (navigator.product && navigator.product == "Gecko") {
         setTimeout("printResults()", 0);
		 points++
		 points = points + 1;
      } 
      else {
         printResults();
		 points++;
		 points = points + 1;
      }
   }
   else {
      alert("Sorry, dynamic table feature works with IE5 or later for Windows, and Netscape 6 or later.");
   }  
}
 
function printTest(operation){
   initializeMathProblemsArray(operation);
   
  
   printChallengeProblems();
   enableFinishedButton();
}
 
function getCurrentTimeInSeconds(){
   return Math.round(new Date().valueOf()/1000);
}
 
function printResults(){
   assert((0 != gStartTime), "Corrupt start time.");
   var elapsedTimeSecs= getCurrentTimeInSeconds() - gStartTime + 1;
   
   printAnswersAndResults(elapsedTimeSecs);

}

function initializeMathProblemsArray(operation){
   var arrayIndex = 0, i, j;
   switch (operation) {
      case kAddition :
         for (i = 0; i <= (kBiggestOperand+1); i++){
            for (j = 0; j <= (kBiggestOperand+1); j++, arrayIndex++){
               gProblemArray[arrayIndex] = {value1:j, value2:i, operation:kAddition, answer:(i+j), theirAnswer:kNotAnswered};    
            }
         }         
         break;
      case kSubtraction :
         for (i = 0; i <= kBiggestOperand; i++){
            for (j = i; j <= kBiggestOperand; j++, arrayIndex++){
               gProblemArray[arrayIndex] = {value1:j, value2:i, operation:kSubtraction, answer:(j-i), theirAnswer:kNotAnswered};  
            }
         }            
         break;
      case kMultiplication :
         for (i = 0; i <= kBiggestOperand; i++){
            for (j = 0; j <= kBiggestOperand; j++, arrayIndex++){
               gProblemArray[arrayIndex] = {value1:j, value2:i, operation:kMultiplication, answer:(i*j), theirAnswer:kNotAnswered};  
            }
         }   
         break;
      case kDivision :
        for (i = 1; i <= (kBiggestOperand-1); i++, arrayIndex++){
               gProblemArray[arrayIndex] = {value1:0, value2:i, operation:kDivision, answer:0, theirAnswer:kNotAnswered};  
         }
         for (i = 1; i <= (kBiggestOperand-1); i++){
            for (j = i; j <= (kBiggestOperand-1); j++, arrayIndex++){
               gProblemArray[arrayIndex] = {value1:(i*j), value2:j, operation:kDivision, answer:i, theirAnswer:kNotAnswered};  
            }
         }               
         break; 
      default:
            alert("BUG: hey this ain't cool - bad operation.");
   }
   var ranNumber;
   while(gProblemArray.length > kNumberOfProblems)
   {      
      ranNumber =  Math.round(Math.random()*(gProblemArray.length-1));
      gProblemArray.splice(ranNumber, 1);
   }
}
 
function printChallengeProblems(){
   var br, u, tr, td, txt, txtBox, font;
   var tbody = document.getElementById(kTableIdForProblems);
   var frag = document.createDocumentFragment();
   
   assert((kNumberOfProblems==gProblemArray.length), "printChallengeProblems: array has been corrupted?");
   tr = document.createElement("tr");
   for (var i = 0; i < kNumberOfProblems; i++) {
      td = document.createElement("td");
      td.setAttribute("align", "right");
         font = document.createElement("font");
       
            txt = document.createTextNode(gProblemArray[i].value1);
         font.appendChild(txt);
      td.appendChild(font);
         br = document.createElement("br");
      td.appendChild(br);
         u = document.createElement("u");
            font = document.createElement("font");
               
               txt = document.createTextNode(gProblemArray[i].operation + " " + gProblemArray[i].value2);
            font.appendChild(txt);
         u.appendChild(font);
      td.appendChild(u);
      tr.appendChild(td);
   }
   frag.appendChild(tr);
   
   if (!tbody.appendChild(frag)) {
      alert("This browser doesn't support dynamic tables.");
   } 
}
 
function enableFinishedButton(){
   document.practiceMathForm.finishedButton.disabled=false;
}
 
function printAnswersAndResults(elapsedTimeInSeconds){
   var tbody, tr, td, txt, font, br;
   var numRight = 0;
   var points = 0;
   tbody = document.getElementById(kTableIdForAnswers);
   var frag = document.createDocumentFragment();
   
   assert((kNumberOfProblems==gProblemArray.length), "printChallengeProblems: array has been corrupted?");

tr = document.createElement("tr");
   for (var i = 0; i < kNumberOfProblems; i++){
      td = document.createElement("td");
         td.setAttribute("align", "right");
            br = document.createElement("br");
         td.appendChild(br);  
         font = document.createElement("font");           
	var points = 0;

         if(gProblemArray[i].theirAnswer == gProblemArray[i].answer)         {  
            numRight++
			points++
			points = points + 1;			
         }
         else         {
            font = document.createElement("font");
            font.setAttribute("size", "-1");
            font.setAttribute("color","red");
            txt = document.createTextNode(gProblemArray[i].value1 +  
                                          gProblemArray[i].operation +
                                          gProblemArray[i].value2 + "=" +
                                          gProblemArray[i].answer);
            font.appendChild(txt);
         }
         td.appendChild(font);
         tr.appendChild(td);
      }
   frag.appendChild(tr);
 
   if (!tbody.appendChild(frag)) {
      alert("This browser doesn't support dynamic tables.");
   } 
 
   tbody = document.getElementById(kTableIdForResults);

   frag = document.createDocumentFragment();
 
   assert((kNumberOfProblems>=numRight),"kNumberOfProblems<numRight!!!");
   var percent = Math.round((numRight/kNumberOfProblems)*100);
   var message;
   if (100 == percent)  
      message = "Perfect!!!";
   else if (100 > percent && 80 <= percent) 
      message = "Very Good!";
   else if (80 > percent && 70 <= percent)
      message = "Good!";
   else if (70 > percent && 50 <= percent)
      message = "Just ok!";
   else
      message = "You need more practice.";  
  
         
   tr = document.createElement("tr");
      td = document.createElement("td");
         td.setAttribute("align", "center");
         td.setAttribute("colspan", kNumberOfProblems);
         font = document.createElement("font");
         font.setAttribute("size", "+1");
            txt = document.createTextNode(numRight + " right out of " + kNumberOfProblems +
               " in " + elapsedTimeInSeconds + " seconds.  " + percent + "%! " + message );
         font.appendChild(txt);
      td.appendChild(font);
   tr.appendChild(td);
   frag.appendChild(tr);
   
   if (!tbody.appendChild(frag)) {
      alert("This browser doesn't support dynamic tables.");
   } 
}
 
function clearChildNodes(elemID) {
   var elem = document.getElementById(elemID);
   while (elem.childNodes.length > 0) 
   {
      elem.removeChild(elem.firstChild);
   }
}
 
</script> 
<style type="text/css">
body {
	background-color: #FFF;
	background-image: url(BlackLeather.jpg);
	color: #0F0;
}
#titleBar tr td font b {
	color: #0F0;
}
</style>
</head> 
 
<body onload="requestPrintTest('+');"> 
 
<table id="stars" width="100%" border="0" align="center" valign="top"><tr> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
</tr></table> 
 
<table id="titleBar" width="100%" valign="top" align="center"><tr> 
<td align="left"><font size="+2"><b>Maths Game</b></font></td> 
</tr></table><br> 
 
 
<form name="practiceMathForm"> 
   <table align="center" width="90%" border="0"> 
   <tbody id="practiceMathTableProblems"></tbody> 
   <tr> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem0"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem1"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem2"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem3"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem4"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem5"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem6"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem7"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem8"></td> 
      <td align="right" valign="top" width="10%"><input type"text" size="3" name="problem9"></td> 
   </tr> 
   <tbody id="practiceMathTableAnswers"></tbody> 
   
   </table> 
 
  <table align="center" width="90%" border="0"> 
   <tbody id="practiceMathTableResults"></tbody> 
  </table><br> 
 
   <center> 
      <input name="finishedButton" type="button" value="I am finished!" onClick="requestPrintResults();  return false;"> 
   </center> 
 
   <table width="100%" border="0" valign="bottom" align="center"><tr> 
      <td valign="center" align="center"> 
         <input type="button" value="Addition" onClick="requestPrintTest('+'); return false;"></td> 
      <td valign="center" align="center"> 
         <input type="button" value="Subtraction" onClick="requestPrintTest('-'); return false;"></td> 
      <td valign="center" align="center"> 
         <input type="button" value="Multiplication" onClick="requestPrintTest('x'); return false;"></td> 
      <td valign="center" align="center"> 
         <input type="button" value="Division" onClick="requestPrintTest('\367'); return false;"></td> 
   </tr></table> 
</form> 
    
 
<table id="stars2" width="100%" border="0" valign="bottom" align="center"><tr> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
   <td valign="center">&nbsp;</td> 
</tr></table>
    </tr>
</body> 
</html>

It seems that your server does not accept certain code format. It started after line 29 of your code. Could you try to delete the new line for your line 25 and 26 in the window.open(....) and make them to be one line instead?

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