// even out height of 2 columns
function fixH(one, two) {
	if (document.getElementById(one)) {
		var lh=document.getElementById(one).offsetHeight;
		var rh=document.getElementById(two).offsetHeight;
		var nh = Math.max(lh, rh);
		document.getElementById(one).style.height=nh+"px";
		document.getElementById(two).style.height=nh+"px";
	}
}

window.onload=function() {
	fixH('left_column', 'right_column');
}