function matchHeight(divs){
	var maxHeight=0;
	for (var i=0;i<divs.length;i++){
		maxHeight=Math.max(maxHeight,document.getElementById(divs[i]).offsetHeight);
	}
	for (var i=0;i<divs.length;i++){
		document.getElementById(divs[i]).style.height=maxHeight+"px";
	}
}