http://xclub.tw/discuz/images/xshow/title.js

1var sPop = null;
2var pltsoffsetX = 10;
3var pltsoffsetY = 15;
4
5document.write('\
6	<style type="text/css"> \
7	#popLayer { \
8		position:absolute; \
9		Z-INDEX: 1000; \
10		text-align : left; \
11		white-space: nowrap; \
12		font-family: Tahoma, Verdana; \
13		visibility: hidden; \
14	} \
15	</style> \
16	<div id="popLayer" class="popupmenu_popup" nowrap></div> \
17');
18
19function showPopupText(event) {
20	try {
21		o = event.srcElement ? event.srcElement : event.target;
22		if (o.alt != null && o.alt != '') { o.pop = o.alt; o.alt = ''; }
23		if (o.title != null && o.title != '') { o.pop = o.title; o.title = ''; }
24		if (o.pop != sPop) {
25			sPop = o.pop;
26			if (sPop == null || sPop == '') {
27				$('popLayer').style.visibility = 'hidden';
28				$('popLayer').innerHTML = '';
29			} else {
30				$('popLayer').style.visibility = 'visible';
31				$('popLayer').innerHTML = sPop.replace(/<(.*)>/g, "&lt;$1&gt;").replace(/\n/g, '<br />');
32				moveToMouseLoc(event);
33			}
34		}
35	} catch (e) {
36		return true;
37	}
38}
39
40function moveToMouseLoc(event){
41	try {
42		if ($('popLayer').innerHTML == '') return true;
43		var MouseX = event.clientX;
44		var MouseY = event.clientY;
45		var popHeight = $('popLayer').offsetHeight;
46		var popWidth = $('popLayer').offsetWidth;
47		if (MouseY + pltsoffsetY + popHeight > document.documentElement.clientHeight - 10) {
48			popTopAdjust =- popHeight - pltsoffsetY * 1.5; 
49		} else {
50			popTopAdjust = 0;
51		}
52		if (MouseX + pltsoffsetX + popWidth > document.documentElement.clientWidth - 10) {
53			popLeftAdjust =- popWidth - pltsoffsetX * 2; 
54		} else {
55			popLeftAdjust = 0;
56		}
57		var pleft = MouseX + pltsoffsetX + document.documentElement.scrollLeft + popLeftAdjust;
58		var ptop = MouseY + pltsoffsetY + document.documentElement.scrollTop + popTopAdjust;
59		$('popLayer').style.left = (pleft > 5 ? pleft : 5) + 'px';
60		$('popLayer').style.top = (ptop > 5 ? ptop : 5) + 'px';
61	  	return true;
62	} catch (e) {
63		return true;
64	}
65}
66/*
67if (!document.onmouseover) {
68	document.onmouseover = function(e) {
69		!e ? showPopupText(window.event) : showPopupText(e);
70	};
71}
72*/