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

function insertAfter(newElement, targetElement) {
	var parent = targetElement.parentNode;
	if (parent.lastChild == targetElement) {
		parent.appendChild(newElement);
	}
	else {
		parent.insertBefore(newElement, targetElement.nextSibling);
	}
}

function addClass(element, value) {
	if (!element.className) {
		element.className = value;
	}
	else {
		newClassName = element.className;
		newClassName += " ";
		newClassName += value;
		element.className = newClassName;
	}
}

//这个函数很有实际作用，专门导航中的每个被点中的链接设置样式，还可以为每个导航链接进去的页面设置ID
function highlightPage() {
	if (!document.getElementById) return false;
	if (!document.getElementsByTagName) return false;
	if (!document.getElementById("navigation")) return false;

	var nav = document.getElementById("navigation");
	var links = nav.getElementsByTagName("a");

	for (var i = 0; i < links.length; i++) {
		var linkurl = links[i].getAttribute("href");
		//alert(linkurl)
		var currenturl = window.location.href;
		//alert(currenturl.indexOf(linkurl).toString());
		if (currenturl.indexOf(linkurl) != -1) {
			//alert(currenturl);
			links[i].className = "here";
			var linktext = links[i].lastChild.nodeValue.toLowerCase();
			//alert(linktext);
			document.body.setAttribute("id", linktext);
		}
	}
}

addLoadEvent(highlightPage);