var submitcount=0;
 function checkFields(){
if (document.linkform.email.value==""){
  alert("Please enter your email address");
  return false;
  }
  if (document.linkform.subject.value==""){
  alert("Please enter your Site Title");
  return false;
  }
  if (document.linkform.linkURL.value=="http://"){
  alert("Please enter the URL of your Links page");
  return false;
  }
   if (document.linkform.linkURL.value==""){
  alert("Please enter the URL of your Links page");
  return false;
  }

if (document.linkform.category.value=="0"){
  alert("Please select a Site Category");
  return false;
 }
 if (document.linkform.linkHTML.value==""){
  alert("Please give us the HTML of your link");
  return false;
 }

   else 
   {
   if (submitcount == 0)
      {
      submitcount++;
      return true;
      }
   else 
      {
      alert("This form has already been submitted. Thanks!");
      return false;
      }
   }
}
//