Uhm. Well i am really not well equipped with jquery knowledge therefore giving me the complete code would be the solution. =]
The function will be
1.get the 70% width of the browser's screen.
2.convert that width into its corresponding px value
3.set the max width of the #mainContainer using the value got from the conversion/calculation.
Need help thanks.
here is the css style for the container i want to set max-width with.
#mainContainer
{
background-image:url(bg3.jpg);
background-repeat:repeat;
background-color:#999;
width:70%;
padding:0;
min-width:940px;/* 940px absolute value of 70%. *
margin:0 auto;
min-height:100%;
/*serves as a divider from content to the main container*/
-webkit-border-radius: 10px;
border-radius: 10px;
}