function SetHome(obj,vrl){
        try{
                obj.style.behavior='url(#default#homepage)';obj.setHomePage(vrl);
        }
        catch(e){
                if(window.netscape) {
                        try {
                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");  
                        }  
                        catch (e) 
 { 
                                alert("抱歉！您的浏览器不支持直接设为首页。请在浏览器地址栏输入“about:config”并回车然后将[signed.applets.codebase_principal_support]设置为“true”，点击“加入收藏”后忽略安全提示，即可设置成功。");  
                        }
                        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
                        prefs.setCharPref('browser.startup.homepage',vrl);
                 }
        }
}
<!--[if lte IE 6]>
stuHover = function() {
var cssRule;
var newSelector;
for (var i = 0; i < document.styleSheets.length; i++)
   for (var x = 0; x < document.styleSheets[i].rules.length ; x++)
    {
    cssRule = document.styleSheets[i].rules[x];
    if (cssRule.selectorText.indexOf("LI:hover") != -1)
    {
     newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover");
     document.styleSheets[i].addRule(newSelector , cssRule.style.cssText);
    }
   }
var getElm = document.getElementById("nav").getElementsByTagName("LI");
for (var i=0; i<getElm.length; i++) {
   getElm[i].onmouseover=function() {
    this.className+=" iehover";
   }
   getElm[i].onmouseout=function() {
    this.className=this.className.replace(new RegExp(" iehover\\b"), "");
   }
}
}
if (window.attachEvent) window.attachEvent("onload", stuHover);
<![endif]-->