if (!document.getElementById) {
	document.getElementById = function(elemID) {
		if (document.all)
			return document.all[elemID];
		else
			return null;
	}
}

window.onload = function() {
	var elem1 = document.getElementById('sidebar_left');
	var elem2 = document.getElementById('page_content');
	var elem3 = document.getElementById('sidebar_right');
	var h1 = elem1.offsetHeight;
	var h2 = elem2.offsetHeight;
	var h3 = elem3 ? elem3.offsetHeight : 0;
	var max_h = Math.max(h1, h3);
	
	if (h2 < max_h) {
		elem2.style.height = (max_h - 27) + 'px';
	}	
}