function pageAlt() {
	var l=document.getElementById('left').offsetHeight;
	var r=document.getElementById('right').offsetHeight;
	var m=document.getElementById('main').offsetHeight;
	if (l<r) l=r;
	if (l<m) l=m;
	document.getElementById('left').style.height=l+'px';
	document.getElementById('right').style.height=l+'px';
	l = l+215;
	document.getElementById('footer').style.top=l+'px';
}