function category() {
	if (!document.getElementById) return false
	if (!document.getElementById("categories")) return false;
	if (!document.getElementsByTagName) return false;

	var categoryList = document.getElementById("categories");
	var listItems = categoryList.getElementsByTagName("LI");
	var even = false;
	for (var i = 0; i < listItems.length; i++)
	{
		if (even)
		{
			if (!listItems[i].className) {
				listItems[i].className = "even";
			}
			else {
				listItems[i].className += " even";	
			}
			even = false;
		}
		else {
			even = true;
		}
	}
}


function addLoadEvent(func) {
	var oldOnLoad = window.onload
	if (typeof window.onload != 'function') 
	{
		window.onload = func;
	}
	else {
		window.onload = function() {
			oldOnLoad();
			func();
		}
	}
}

addLoadEvent(category);