window.onload = function() {
	var bodyH = document.body.offsetHeight;
	var winH = 0;
	if(window.innerHeight) {
		winH = window.innerHeight;
	} else if(document.documentElement.clientHeight) {
		winH = document.documentElement.clientHeight;
	}

	if(winH > bodyH) {
		var hDiff = (winH - bodyH) + 15;
		hDiff *= -1;
		hDiff += "px";
		document.getElementById("footer").style.bottom = hDiff;
	}
}

window.onresize = function() {
	var bodyH = document.body.offsetHeight;
	var winH = 0;
	if(window.innerHeight) {
		winH = window.innerHeight;
	} else if(document.documentElement.clientHeight) {
		winH = document.documentElement.clientHeight;
	}

	if(winH > bodyH) {
		var hDiff = (winH - bodyH);
		hDiff *= -1;
		hDiff += "px";
		document.getElementById("footer").style.bottom = hDiff;
	} else {
		document.getElementById("footer").style.bottom = "-15px";
	}
}