function SetHome(obj){ 
		var vrl = "http://www.gd-id.com/" ;
        try{ 
                obj.style.behavior='url(#default#homepage)';obj.setHomePage(vrl); 
        } 
        catch(e){ 
                if(window.netscape) { 
                        try { 
                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
                        } 
                        catch (e) { 
                                alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。"); 
                        } 
                        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch); 
                        prefs.setCharPref('browser.startup.homepage',vrl); 
                 } 
        } 
}