Simple columnize javascript function

columnize.js

	function columnize(ul){
		var offsetTop = YAHOO.util.Dom.getRegion(ul).top;
		var listItems = ul.getElementsByTagName('li');
		for(var i=0,l=listItems.length;i<l;i++){
			var region = YAHOO.util.Dom.getRegion(listItems[i]);
			if(region.bottom - offsetTop > 200){
				var clone = ul.cloneNode(true);
				// remove all list items that follow this one from the current list. (will be covered by the clone)
				for(var j=l-1; j>=i; j--){
					ul.removeChild( ul.lastChild );
				}
				// remove all list items that precede this one from the clone. (are covered by the original list)
				for(var j=i; j>0; j--){
					clone.removeChild(clone.firstChild);
				}
				ul.parentNode.appendChild(clone);
				// recurse - check whether the clone also needs to be columnized (if it's too tall)
				columnize(clone);
				return;
			}
		}
	}