function valid()
{
  if(document.has.Name.value=="")
  {
   alert("Please enter your Full Name");
   document.has.Name.focus();
   return false;
  }
   if(document.has.CompanyName.value=="")
  {
   alert("Please enter your Company Name");
   document.has.CompanyName.focus();
   return false;
  }
  if( document.has.PhoneNumber.value=="")
  {
   alert("Please enter your Phone Number");
   document.has.PhoneNumber.focus();
   return false;
  }
   if( document.has.opinion.value=="")
  {
   alert("Please enter your opinion");
   document.has.opinion.focus();
   return false;
  }

return true;
}