function validate(thisform){
   var errorMessage = "";
   if(thisform["firstname"].value==""){
      errorMessage += "First Name is required.\n";
   }
   if(thisform["lastname"].value==""){
      errorMessage += "Last Name is required.\n";
   }
   if(thisform["jobtitle"].value==""){
      errorMessage += "Job Title is required.\n";
   }
   if(thisform["company"].value==""){
      errorMessage += "Company Name is required.\n";
   }
   if(!/^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/.test(thisform["email"].value)){
      errorMessage += "Enter a valid email address.\n";
   }
   if(errorMessage){
      alert(errorMessage);
      return false;
   } else {
      return true;
   }
}