跳出导航窗口

鼠标放上去一会就弹出说明框

脚本说明：
把如下代码加入<body>区域中:
<SCRIPT LANGUAGE="JavaScript">

<!-- Begin

var hmsg = new Array();

hmsg["home"] = new helpmsg(
"Home Page",  "fancyheader", "plain", "Clicking this link will bring you to the JavaScript Source home page.");

hmsg["forum"] = new helpmsg(
"", "", "bold", "Ask a JavaScript question or post a script request and our other JavaScript-savvy visitors will try to help you.");

hmsg["faq"] = new helpmsg(
"JavaScript Source FAQs", "h2", "italics", "Answers to the most common JavaScript questions we receive at The JavaScript Source.");

hmsg["news"] = new helpmsg(
"", "", "", "A monthly newsletter with links to all the script we've added to the site in the last month, a webmaster-related column, and links to other useful webmaster sites.");

var myPopup = new helpbox("myPopup", hmsg, 275, 175, "#ffffee");

function helpmsg(header, hstyle, mstyle, message) {
this.DEFAULTHSTYLE = "plain";
this.DEFAULTMSTYLE = "plain";

this.header = header;
if (hstyle) this.hstyle = hstyle;
else this.hstyle = this.DEFAULTHSTYLE;
this.message = message;
if (mstyle) this.mstyle = mstyle;
else this.mstyle = this.DEFAULTMSTYLE;
return this;
}
new helpmsg();
helpmsg.prototype.show = show;

function show() {
var H = "<FONT FACE='arial'>" + this.header + "</FONT>";
if (this.hstyle == "h1") H = "<H1>" + H + "</H1>";
else if (this.hstyle == "h2") H = "<H2>" + H + "</H2>";
else if (this.hstyle == "h3") H = "<H3>" + H + "</H3>";
else if (this.hstyle == "h4") H = "<H4>" + H + "</H4>";
if (this.hstyle == "fancyheader") H = "<table width='75%'>" +
"<tr><td bgcolor='#6060ff' align='center' valign='center'>" +
"<H1><FONT COLOR='white'>" + H +
"</FONT></H1>" + "</td></tr></table>";
else if (this.hstyle == "italics")
H = "<I>" + H + "</I>";

var M = "<FONT FACE='arial'>" + this.message + "</FONT>";
if (this.mstyle == "plain") {}
if (this.mstyle == "italics") M = M.italics();
else if (this.mstyle == "bold") M = M.bold();

var htmlpage = "";
if (this.hstyle.indexOf("header")>=0)
htmlpage = H + M;
else htmlpage = H + "<BR>" + M;
return htmlpage;
}