var DomComp = (document.getElementById)? true:false;
var ns4		= (document.layers)? true:false;
var newHeight;
if (DomComp) {
	var elemHeight1 = 
	newHeight = document.getElementById('MainContent').offsetHeight+250;
	document.getElementById('footer').style.top = newHeight + "px";
	document.getElementById('footer').style.visibility = "visible";
}
else if (ns4){
	newHeight = document.layers['MainContent'].clip.height+250;
	document.layers['footer'].top = newHeight ;
	document.layers['footer'].visibility = "visible";
}