function ValidateUsayForm(f)
{
 if(f.firstname.value == "" || f.lastname.value == "" || f.memberlevel.value == "" || f.adress.value == "" || f.city.value == "" || f.postno.value == "" || f.email.value == "" || f.phoneno.value == "" || f.state.value == "" || f.country.value == ""){
   alert("You must fill in all fields!");
   return false; 
 }
 if(f.email.value != ""){
   if(!isEmail(f.email.value)){
      alert("Incorrect email adress: " + f.email.value);
      return false;
   }
 }

  return true;
}

function isEmail(e){ 
if(e.indexOf ('@',0) == -1 || e.indexOf ('.',0) == -1){ 
   return false; 
   }
return true;
}