function setMainDivHeight()
{
	var menuHeight 				= document.getElementById('menu').offsetHeight;
	var topDivHeight			= document.getElementById('topDiv').offsetHeight;
	var altDivHeight			= document.getElementById('altDiv').offsetHeight;
	var mainDivHeight			= document.getElementById('mainDiv').offsetHeight;
	//var fullContent				= contentTypeMenuHeight+topDivHeight;
	
	//alert('menu:' + menuHeight + ', topDiv:' + topDivHeight + ', contentTypeMenu:' + contentTypeMenuHeight + ', siteBox:' + siteBoxHeight + ', content:' + contentHeight + ', topDivHeight+contentTypeMenuHeight:');

	if(altDivHeight < mainDivHeight)
	{
		document.getElementById('altDiv').style.height = mainDivHeight + 'px';
	}
	else if(mainDivHeight < altDivHeight)
	{
		document.getElementById('mainDiv').style.height = altDivHeight + 'px';
	}

	if(mainDivHeight < altDivHeight)
	{
			document.getElementById('topDiv').style.height = (altDivHeight) + 'px';
	}
	else if(altDivHeight < mainDivHeight)
	{
			document.getElementById('topDiv').style.height = (mainDivHeight) + 'px';
	}
}