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 contentHeight = document.getElementById('content').offsetHeight;
			var footerElement = document.getElementById('footer');
			var footerHeight  = footerElement.offsetHeight;
			if(windowHeight - (contentHeight + footerHeight) >= 0) {
				////
				var content_wrapperTopPos = document.getElementById('content_wrapper').offsetTop;
				var content_wrapperElement = document.getElementById('content_wrapper');
				content_wrapperElement.style.height = (windowHeight - content_wrapperTopPos - footerHeight - 70) + 'px';						
				////
				footerElement.style.position = 'relative';
				footerElement.style.top = (0) + 'px';
			}
			else {
				footerElement.style.position = 'static';
			}
		}
	}
}

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

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