function initialize() {
	if(!window.XMLHttpRequest){ //PNG fix for IE6
		DD_belatedPNG.fix('#top_spacer');
		DD_belatedPNG.fix('#total');
	}
	
	var windowHeight = "";
	var bodyHeight = document.getElementsByTagName("body")[0].offsetHeight;
	var contentBodyDiv = document.getElementById("mainContent");
	
	if (!document.all) {
		windowHeight = window.innerHeight;
	} else {
		windowHeight = document.documentElement.clientHeight;
	}
	
	if (bodyHeight < windowHeight) {
		if (contentBodyDiv) {
			contentBodyDiv.style.height = windowHeight - document.getElementById("header").offsetHeight - document.getElementById("total").offsetHeight - document.getElementById("mainNav").offsetHeight - document.getElementById("footer").offsetHeight  + "px";
		}
	}
}