function matchCols() {

	if($('sidebar')) {
		if($('sidebar').getHeight() < $('main_content').getHeight())
			$('sidebar').style.height = $('main_content').getHeight() + "px";
		else
			$('main_content').style.height = $('sidebar').getHeight() + "px";
	}
	if($('left_column') && $('right_column')) {
		if($('right_column').getHeight() < $('left_column').getHeight())
			$('right_column').style.height = $('left_column').getHeight() + "px";
		else
			$('left_column').style.height = $('right_column').getHeight() + "px";
	}
}
window.onload = matchCols;