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 h1 = elem1.offsetHeight;
	var h2 = elem2.offsetHeight;
	
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		elem1.style.height = (h2 - 46) + 'px';
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}