function checkRequired()
 {
      var first_name=document.getElementById("first_name").value;
      var last_name=document.getElementById("last_name").value;
      var phone=document.getElementById("phone").value;
      var email=document.getElementById("email").value;
      var company=document.getElementById("company").value;
	  
	  if (! first_name)
      {
        alert("First name is required.");
        return false;
      }

      if (! last_name)
      {
        alert("Last name is required.");
        return false;
      }

      if (! company)
      {
        alert("Company is required.");
        return false;
      }

      if (! email)
      {
        alert("Email is required.");
        return false;
      }

      if (! phone)
      {
        alert("Phone is required.");
        return false;
      }

  return true;
}