在IE下，我们可以轻松使用以下代码来实现设置主页：

<a class="chlnk" style="cursor:hand;font-weight:bold;color:#004080;font-family:Verdana" HREF onClick="this.style.behavior='url(#default#homepage)';this.setHomePage('http://www.devdao.com');">Click here to make devdao.com your default homepage!</a>
然而，在firefox下是不行的

要使用脚本在firefox下设置主页，首先必须确认在浏览器的“about:config”中，把
signed.applets.codebase_principal_support
设置成true

然后使用以下脚本：
<script language="javascript">
function setHomepage()
{
    if (document.all)
    {
        document.body.style.behavior='url(#default#homepage)';
        document.body.setHomePage('http://www.asp.net/130.aspx');
    }
    else if (window.sidebar)
    {
        if(window.netscape)
        {
            try
            {
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
            }
            catch(e)
            {
                alert("this action was aviod by your browser，if you want to enable，please enter about:config in your address line,and change the value of signed.applets.codebase_principal_support to true");
            }
         }
         var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components. interfaces.nsIPrefBranch);
         prefs.setCharPref('browser.startup.homepage','http://www.asp.net/130.aspx');
     }
}
</script>

<input type="button" value="set home page" onclick="setHomepage();" />