function alert_breadcrumb(breadcrumb_box,alert_text) {
	if (!document.getElementById) return false;
	if (!document.getElementsByTagName) return false;
	if (!document.getElementById(breadcrumb_box)) return false;
	var breadcrumb = document.getElementById(breadcrumb_box);
	var bread_links = breadcrumb.getElementsByTagName("a");
	var links_number = bread_links.length;
	if (links_number < 2) return false;
	var first_link = bread_links[0];
	if (first_link.lastChild.nodeValue == "Root" || first_link.lastChild.nodeValue == "root" || first_link.lastChild.nodeValue == "ROOT") {
		first_link.lastChild.nodeValue = alert_text;
	}
	var bread_separator = breadcrumb.getElementsByTagName("span");
	bread_separator[1].lastChild.nodeValue = ">>";
	if (!document.createElement) return false;
	if (!document.createTextNode) return false;
	var last_link = bread_links[links_number - 1];
	var last_link_text = last_link.lastChild.nodeValue;
	var last_bread = document.createElement("span");
	var last_bread_text = document.createTextNode(last_link_text);
	last_bread.appendChild(last_bread_text);
	last_bread.setAttribute("id","bread-current");
	last_link.parentNode.replaceChild(last_bread,last_link);
}
alert_breadcrumb("breadcrumb","首页");