function getWindowHeight() {
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	}
	else {
		if (document.documentElement && document.documentElement.clientHeight) {
			windowHeight = document.documentElement.clientHeight;
		}
		else {
			if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}

function setFooter() {
	if (document.getElementById) 
	{
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) 
		{
			var headerElement = document.getElementById('header');
			var headerHeight  = headerElement.offsetHeight;
			
			if(document.getElementById('mainNav') == null)
				headerHeight = headerHeight + 29;
			else
				headerHeight = headerHeight + document.getElementById('mainNav').offsetHeight;
				
			if(document.getElementById('divLogin') != null)
			{
				if(document.getElementById('divLogin').style.display == "block")
				{
					headerHeight = headerHeight + 49;
				}	
			}
			
			var contentElement = document.getElementById('mainContent');
			var contentInner = document.getElementById('contentInner');
			var contentHeight  = contentElement.offsetHeight;
			var footerElement = document.getElementById('footer');
			var footerHeight  = footerElement.offsetHeight;
			var stuffHeight = headerHeight + footerHeight;
			if (windowHeight - stuffHeight >= 0 && dcontentHeight <=  (windowHeight - stuffHeight)) 
			{
				contentElement.style.height = windowHeight - stuffHeight + "px";
				contentInner.style.height = windowHeight - stuffHeight + "px";
			}
		}
	}
}

var dcontentHeight;
window.onload = function() {
	dcontentHeight = document.getElementById('mainContent').offsetHeight;
	setFooter();
}

window.onresize = function() {
	setFooter();
}