function positionFooter(){
	var heightContent = 0;
	// Get biggest column height by checking left, middle and right column

		heightContent = document.getElementById('rightSide').offsetHeight > heightContent ? document.getElementById('rightSide').offsetHeight : heightContent;
    heightContent = heightContent + 360;
		
	// Is there an element with the ID "div_footer"?
	if (document.getElementById('footer')){
		// IE or not IE?
		if (navigator.userAgent && navigator.userAgent.indexOf("MSIE") >= 0){
			document.getElementById('footer').style.setAttribute('top', heightContent + 'px');
			document.getElementById('footer').style.setAttribute('visibility', 'visible');
		}else{
			document.getElementById('footer').style.setProperty('top', heightContent + 'px', null);
			document.getElementById('footer').style.setProperty('visibility', 'visible', null);
		}
	}
}