function ValidLength(item, len) {
     return (item.length >= len);
  }

  function error(elem, text) {
     if (errfound) return;
     window.alert(text);
     elem.select();
     elem.focus();
     errfound = true;
  }

  function signup_validate() {
	errfound = false;
	if (!ValidLength(document.getElementById("buyer_name").value,1))  
	error(document.getElementById("buyer_name"),"Du skal skrive et navn!");
 
	if (!ValidLength(document.getElementById("buyer_email").value,1))  
	error(document.getElementById("buyer_email"),"Du skal skrive en e-mail!");
  
  return !errfound;
  }