var CBKSiteMap = {};
CBKSiteMap.setHeight = function () {
	var d = document;
	var box = new Array("col1","col2", "col3"); //list of DIV ids
	for(x=0;x<box.length;x++)//determine the tallest div
	{
		h = d.getElementById(box[x]).offsetHeight;
		for(y=0;y<box.length;y++)
		{
			test_h = d.getElementById(box[y]).offsetHeight;
			if(h<test_h) { h = test_h; }
		}
	}
	for(x=0;x<box.length;x++)//set the height of all divs to the tallest
	{
		d.getElementById(box[x]).style.height = h +"px";
	}
};

//Launches setHeight() on page load
Event.observe(window,"load",CBKSiteMap.setHeight);