* {margin:0; padding:0;} 

div#whole {min-width:780px; max-width:960px; 
	margin-left:auto; margin-right:auto; /* centers the layout  */}
div#contentarea { 
	position:relative; }

div#column1 {width:150px; 
	position: absolute; 
	top:0px; left:0px; 
	overflow:hidden; }

div#column2 {
	margin:0 170px 0 150px; /* make room for sidebars */}
div#column3 {width:170px; 
	position:absolute;  
	top:0px; right:0px; 
	overflow:hidden; }

• Centre area is between 460px and 640px
• Left is 150px, right is 170px
• Larger than 960px you get white space either side