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

function setFooter() {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight>0) {
			var mainElement = document.getElementById('maincontainer');
			mainElement.style.height='';
			var contentHeight = mainElement.offsetHeight;
			if (windowHeight > contentHeight) {
				contentHeight = windowHeight-26;
				mainElement.style.height = (contentHeight) + 'px';
				var footer = document.getElementById('footer');
				footerHeight = footer.offsetHeight;
				footer.style.position='absolute';
				footer.style.bottom='0';
			}
		}
	}
}

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;
}