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();
				windowHeight = windowHeight - 1;
				if (windowHeight > 0) {
					var contentHeight = document.getElementById('main').offsetHeight;
					var contentElement = document.getElementById('main');
					var footerHeight = document.getElementById('footer').offsetHeight;
					if (windowHeight>contentHeight) {
						document.getElementById('main').style.height = windowHeight + 'px';
						document.getElementById('footer').style.position = 'absolute';
						document.getElementById('footer').style.top = (windowHeight - footerHeight + 1) + 'px';
					}
				}
			}
		}
		window.onload = function() {
			setFooter();
		}
		window.onresize = function() {
			setFooter();
		}