Check Whether the Logged User is Admin or Not using JQuery & SharePoint Default WebServices

1. First Place one Login Control within a Master Page and Take IT's ID from the View Source of the Page.
2. Download the SPAPI_Core.JS File
3. Download the SPAPLI_UserGroup.JS File

var strSiteUrl="http://SPSERVER:100";
var objGroup=new SPAPI_UserGroup(strSiteUrl);


function checkAdminUser()
{
   var strValidUser=false;
    var strCurrentUser=$("#ctl00_lgnUser").html();
    var ug1 = objGroup.getGroupCollectionFromUser(strCurrentUser);
    $(ug1.responseXML).find("Group").each(function()
    {
         if($(this).attr("ID")==3)
         {
             strValidUser=true;
         }
   
    });
   
    if(strValidUser==true)
    {
        alert('The User Logged is Admin User');
    }
}

$(document).ready(function()
{
    checkAdminUser();
});