// JavaScript Document
function measure() {
	oFooter = document.getElementById("footer");
	contentHeight = document.getElementById("mainarea").offsetHeight;
	htmlheight = document.body.scrollHeight; 
	difference = (htmlheight - contentHeight);
	if ( contentHeight < 0 ) { 
				oFooter.style.display = 'none'; 
		}  
		else { 
			oFooter.style.height = (difference - 120) + "px";
		}  
}

    /* calls the function after the page is loaded */
		addLoadEvent( measure );
		addResizeEvent( measure );