function submitForm()
{
   if (validData()){
      document.frmlookup.submit();
   }
}

function validData()
{
   with (document.frmlookup){
       if(username.value== ""){  
           alert("Please provide the username.");
           username.focus();
           return false;
       }
       if(email.value== ""){
           alert("Please provide the e-mail address.");
           email.focus();
           return false;
       }
   }
   return true;
}