function resize() {
	var bodyE   = document.getElementsByTagName('body')[0];
	var centerH = document.getElementById('main'     ).offsetHeight;
	var leftH   = document.getElementById('side'  ).offsetHeight;
	var height = Math.max(centerH,leftH,bodyE.clientHeight - 240);

	document.getElementById('main'   ).style.height =  height    +"px";
	document.getElementById('side'     ).style.height = (height+15)    +"px";
}