abgeschickt=0;

function SetFocus()
{
   document.email.Firma.focus();
   return;
}

function Eingabepruefen()
{
   if (document.email.Firma.value == "") 
   {
      alert("Please enter your company name!"); 
      document.email.Firma.focus()
   }
   else if (document.email.Name.value == "")
   {
      alert("Please enter your name!");
      document.email.Name.focus();
   }
   else if (document.email.Ort.value == "") 
   {
      alert("Please enter your postal address!"); 
      document.email.Ort.focus()
   }
   else if (document.email.URL.value == "http://") 
   {
      alert("Please enter the the website address of your company!"); 
      document.email.URL.focus()
   }
   else if (document.email.EMail.value == "")
   {
      alert("Please enter your current email address!");
      document.email.EMail.focus()
   }
   else if (document.email.EMail.value.indexOf('@', 0) == -1)
   {
      alert("Your email address is not correct!");
      document.email.EMail.focus();
      document.email.EMail.select()
   }
   else if (document.email.nospam.value != "2")
   {
      alert("I ensure that this is no SPAM!");
    }
   else
   {
      if (abgeschickt==0)
      {
         abgeschickt=1;
         document.email.submit();
      }
      else
      {
         alert("Your message has already been sent!");
      }
   }
}