include jQuery source file in asp.net-Collection of common programming errors

I have a drop down list and some styles applied to it from two js files, included in head like:

All it’s working great when the page is loading for the first time.

But when i do an ajax request on this page the styles applied before, are lost, so i have included the js src files from the code behing like:

 protected void Page_PreRender(object sender, EventArgs e)
{
    loadJs();
}

private void loadJs()
{
    ScriptManager.RegisterClientScriptInclude(this,
        typeof(Page),
        "AlertScript",
        ResolveClientUrl("~/Site/js/jquery.jqtransform.js"));
    ScriptManager.RegisterClientScriptInclude(this,
       typeof(Page),
       "AlertScript2",
       ResolveClientUrl("~/Site/js/functions.js"));
}

But…it’s still not working although i see in the broswer – view source that the js files are loaded correctly in the body…

Do you have any suggestion?

Thanks in advance.