// JavaScript Document

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('mid').offsetHeight;
var footerElement=
document.getElementById('footer');
var footerHeight=footerElement.offsetHeight;
if (windowHeight-(contentHeight+footerHeight)>=0) {
footerElement.style.position='relative';
footerElement.style.top=(windowHeight-
(contentHeight+footerHeight))+'px';
}
else {
footerElement.style.position='static';
}
}
}
}

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