function chkformmail()
{
 if(document.formmail.Name.value == "")  {
   alert("Please enter your name!");
   document.formmail.Name.focus();
   return false;
  }
   if(document.formmail.Vorname.value == "")  {
   alert("Please enter your forename!");
   document.formmail.Vorname.focus();
   return false;
  }
  if(document.formmail.Strasse.value == "")  {
   alert("Please enter your street!");
   document.formmail.Strasse.focus();
   return false;
  }
 if(document.formmail.PLZ.value == "") {
   alert("Please enter your Zipcode!");
   document.formmail.PLZ.focus();
   return false;
  }
 var chkZ = 1;
 for(i=0;i<document.formmail.PLZ.value.length;++i)
   if(document.formmail.PLZ.value.charAt(i) < "0"
   || document.formmail.PLZ.value.charAt(i) > "9")
     chkZ = -1;
 if(chkZ == -1) {
   alert("Zipcode must be a number!");
   document.formmail.PLZ.focus();
   return false;
  }
 if(document.formmail.Ort.value == "") {
   alert("Please enter your place!");
   document.formmail.Ort.focus();
   return false;
  } 
if(document.formmail.Telefon.value == "") {
   alert("Please enter your telephone number!");
   document.formmail.Telefon.focus();
   return false;
  }  
}