help adjusting javascript code

[MDanz]

this is code for the pop up div, but i want the pop up div to display where the cursor is clicked. I need help adjusting this code to do that?

x = 20;
y = 70;
function setVisible(obj)
{
   obj = document.getElementById(obj);
   obj.style.visibility = (obj.style.visibility == 'visible') ? 'hidden' : 'visible';

   var obj = ( function( thisId ) {
      var myObj = document.getElementById( thisId ) || document.all[ thisId ];
         return myObj;
         } );
   
  
      var newtext2 = obj( "reply" ).value;
	  var number = obj( "idno" ).value;

var newtext4=("<a href=" + number + ">" + newtext2 + "</a>");
         obj( "layer1" ).innerHTML =  (( newtext4 ) ? newtext4 : "null" )+obj( "real" ).innerHTML;
		
}
function placeIt(obj)
{
   obj = document.getElementById(obj);
   if (document.documentElement)
   {
      theLeft = document.documentElement.scrollLeft;
      theTop = document.documentElement.scrollTop;
   }
   else if (document.body)
   {
      theLeft = document.body.scrollLeft;
      theTop = document.body.scrollTop;
   }
   theLeft += x;
   theTop += y;
   obj.style.left = theLeft + 'px' ;
   obj.style.top = theTop + 'px' ;
   setTimeout("placeIt('layer1')",500);
   
   
}
window.onscroll = setTimeout("placeIt('layer1')",500);