hi i m new to jquery

i have to call a web service
http://tt.shine.com/AccountAPI/NewAccountWS.asmx/CheckExistingCompany?text=anyname

$.ajax({
      type: "POST",
      url: url,
      data: "{}",   
      dataType: "html",
       success: function(msg) {
        // Replace the div's content with the page method's return.
        alert(msg);
        //$("#Result").text(msg.d);
      }
    });

this code is working fine in IE but in mozilla its giving 403 forbidden
Please help me

Thanx in advance