鼠标放在文字上就出现相应的提示信息

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var QA = new Array();
QA[0] = new Array("星期一", "星期一的信息提示");
QA[1] = new Array("星期二", "星期二的信息提示");
QA[2] = new Array("星期三", "星期三的信息提示");
QA[3] = new Array("星期四", "星期四的信息提示");
QA[4] = new Array("星期五", "星期五的信息提示");

var ql = QA.length - 1;
var qx = Math.round(Math.random() * ql);
if (qx < 0) { qx = 0; };
x = QA[qx][0], y = QA[qx][1];
var isNav = (navigator.appName.indexOf("Netscape") != -1);
var Ypos = 0;
function setupDescriptions() {
var x = navigator.appVersion;
y = x.substring(0,4);
if (y >= 4) setVariables();
}
var x, y, a, b;
function setVariables() {
if (navigator.appName == "Netscape") {
h=".left="; v=".top="; dS="document."; sD="";
}
else {
h=".pixelLeft="; v=".pixelTop="; dS=""; sD=".style";
   }
}
function popLayer(a) {
desc = "<table cellpadding=3 border=1 bgcolor=F7F7F7><td>" + a + "</td></table>";
if(isNav) {
document.q1.document.write(desc);
document.q1.document.close();
document.q1.left = x+25;
document.q1.top = y+40;
}
else {
y = Ypos - 15;
q1.innerHTML = desc;
eval(dS+"q1"+sD+h+(x+25));
eval(dS+"q1"+sD+v+(y+40));
   }
}
function hideLayer(a) {
if(isNav) {
eval(document.q1.top = a);
}
else q1.innerHTML = "";
}
function doQuestion() {
var text;
if (!isNav) {
text = "<div id=\"q1\" style=\"position:absolute; "
+ "visibility:show; left:25px; top:-50px; z-index:2\">layer "
+ "hidden off the screen</div><br><a nohref "
+ "onMouseover=\"popLayer('" + y + "')\" "
+ "onMouseout=\"hideLayer(-50)\"><font size=+1 "
+ "color=\"black\"><b>" + x + "</b></font></a><br>";
}
if(isNav) {
text = "<br><a href onmouseover=\"alert('" + y + "!');return "
+ "true\" onmouseout=\"status=' '\"><font size=+1 "
+ "color=\"black\"><b>" + x + "</b></font></a><br>";
}
document.write(text);
}
function handlerMM(e) {
x = (isNav) ? e.pageX : event.clientX;
y = (isNav) ? e.pageY : event.clientY;
if (!isNav) { Ypos = window.event.y + document.body.scrollTop; }
}
if (isNav) {
document.captureEvents(Event.MOUSEMOVE);
}
document.onmousemove = handlerMM;
//  End -->
</script>
<script>
doQuestion();
</script>