分为二种情况，一是设置网站为首页，二是设置当前页为首页。
1，设为首页
代码如下：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>设为首页</title>
</head>
<body>
<p>方法一：<span onclick="var strHref=window.location.href;this.style.behavior='url(#default#homepage)';
this.setHomePage('http://www.jb200.com');" style="CURSOR: hand">设为首页</a></span></p>
<p>
方法二：<a title="设为首页" onclick="this.style.behavior='url(#default#homepage)';
this.setHomePage('http://www.jb200.com');" href="javascript:;">设为首页</a> </p>
</body>
</html>
附，兼容性不错的设为首页与加入收藏夹的代码。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>设为首页与添加收藏夹-兼容多浏览器-www.jb200.com</title>
<script language="javascript">
function addBookmark(title,url) {
if (window.sidebar) {
window.sidebar.addPanel(title, url,"");
} else if( document.all ) {
window.external.AddFavorite( url, title);
} else if( window.opera && window.print ) {
return true;
}
}
function setHome(url)
{
if (document.all){
document.body.style.behavior='url(#default#homepage)';
document.body.setHomePage(url);
}else if (window.sidebar){
if(window.netscape){
try{
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
}catch (e){
alert( "该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true" );
}
}
if(window.confirm("确定要设置"+url+"为首页吗？")==1){
var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
prefs.setCharPref('browser.startup.homepage',url);
}
}
}
</script>
</head>
<body>
<a href="javascript:void(null)" onClick="setHome('http://www.jb200.com');">设为首页</a> -
<a href="javascript:addBookmark('脚本之家','http://www.jb200.com')">加入收藏</a>
</body>
</html>