function setColumns() {
	var col1 = document.getElementById('contentLeft');
	var col2 = document.getElementById('mainContent');
	var n1 = col1.clientHeight;
	var n2 = col2.clientHeight;
	var max = Math.max(n1,n2);
	if (max > n1) { 
		col1.style.height = max+'px';
	}
	if (max > n2) { 
		col2.style.height = max+'px';
	}
	var p = col1.parentNode;
	p.style.height = max+'px';
}