function enableTooltips(id) {
	var links, i, h;
	if (!document.getElementById || !document.getElementsByTagName)
		return;
	AddCss();
	h = document.createElement("span");
	h.id = "btc";
	h.setAttribute("id", "btc");
	h.style.position = "absolute";
	document.getElementsByTagName("body")[0].appendChild(h);
	if (id == null)
		links = document.getElementsByTagName("a");
	else
		links = document.getElementById(id).getElementsByTagName("a");
	for (i = 0; i < links.length; i++) {
		Prepare(links[i]);
	}
}
function Prepare(el) {
	enable = el.getAttribute("enabletitle");
	var tooltip, t, b, s, l;
	t = el.getAttribute("title");
	if (t == null || t.length == 0)
		t = "link:";

	if (enable == "true") {
		el.removeAttribute("title"); // 修改，移动到了这里

		tooltip = CreateEl("span", "tooltip");
		s = CreateEl("span", "top");
		s.appendChild(document.createTextNode(t));
		tooltip.appendChild(s);
		b = CreateEl("b", "bottom");
		l = el.getAttribute("href");
		if (l.length > 30)
			l = l.substr(0, 27) + "...";
		b.appendChild(document.createTextNode(l));
		tooltip.appendChild(b);
		tooltip.style.backgroundColor = "#EEEEEE"; // 稍微修饰下，加个背景，免得和下面的字叠加
		setOpacity(tooltip);
		el.tooltip = tooltip;
		el.onmouseover = showTooltip;
		el.onmouseout = hideTooltip;
		el.onmousemove = Locate;
	}
}
function showTooltip(e) {
	document.getElementById("btc").appendChild(this.tooltip);
	Locate(e);
}
function hideTooltip(e) {
	var d = document.getElementById("btc");
	if (d.childNodes.length > 0)
		d.removeChild(d.firstChild);
}
function setOpacity(el) {
	el.style.filter = "alpha(opacity:50)";
	el.style.KHTMLOpacity = "0.5";
	el.style.MozOpacity = "0.5";
	el.style.opacity = "0.5";
}
function CreateEl(t, c) {
	var x = document.createElement(t);
	x.className = c;
	x.style.display = "block";
	return (x);
}
function AddCss() {
	var l = CreateEl("link");
	l.setAttribute("type", "text/css");
	l.setAttribute("rel", "stylesheet");
	l.setAttribute("href", "?.css");
	l.setAttribute("media", "screen");
	document.getElementsByTagName("head")[0].appendChild(l);
}
function Locate(e) {
	var posx = 0, posy = 0;
	if (e == null)
		e = window.event;
	if (e.pageX || e.pageY) {
		posx = e.pageX;
		posy = e.pageY;
	} else if (e.clientX || e.clientY) {
		if (document.documentElement.scrollTop) {
			posx = e.clientX + document.documentElement.scrollLeft;
			posy = e.clientY + document.documentElement.scrollTop;
		} else {
			posx = e.clientX + document.body.scrollLeft;
			posy = e.clientY + document.body.scrollTop;
		}
	}
	document.getElementById("btc").style.top = (posy + 10) + "px";
	document.getElementById("btc").style.left = (posx - 20) + "px";
}