var flag = "";
            $(document).ready(function(){
                $("body").load("form.php?type=insert");
       });

            var flag = "";
            alert("loading...");
$("#myform").submit(function(){

                    var x = $('#emailid').val();

                    var atpos=x.indexOf("@");
                    var dotpos=x.lastIndexOf(".");
                    if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
                      {
                          if(flag)
                              {
alert(flag + "Not a valid e-mail address");
return false;
                              }
                              else
                                  {
                                      alert(flag + "Username and email are not valid");
                                      return false;
                                  }
                      }
                      return true;
    });


$("#username").blur(function(){
  $.post("check_username.php",
  {
    username: $(this).val()
  },
  function(data,status){
if(data == 1)
{
   document.getElementById('un').innerHTML="<font color=\"green\">Username Available!</font>";
  //  alert("Username exists");
    flag = true;
}
else
{
   document.getElementById('un').innerHTML="<font color=\"red\">Sorry, Username already taken!</font>";
//alert("Sorry, Username already taken");
flag = false;
}
  });
});


               function checkEmail() {
                   flag = true;

                    var x = $('#emailid').val();

                    var atpos=x.indexOf("@");
                    var dotpos=x.lastIndexOf(".");
                    if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
                      {
alert("Not a valid e-mail address");
flag = false;
return flag;
                      }
                      return flag;
                    }