function ValNull(item) {
  if (item == "") return false; 
     return true;
}

function NoChar(item){
	if (item.indexOf ('<', 0) != -1) return false;
        if (item.indexOf ('>', 0) != -1) return false;
   return true;
}

function ValidEmail(item) {
	if (item.indexOf (':', 0) != -1) return false;
	if (item.indexOf ('#', 0) != -1) return false;
	if (item.indexOf ('/', 0) != -1) return false;
	if (item.indexOf ('ü', 0) != -1) return false;
	if (item.indexOf ('@', 0) == -1) return false;
	if (item.indexOf ('.', 0) == -1) return false;
	if (item.indexOf ('û', 0) != -1) return false;
	if (item.indexOf ('ú', 0) != -1) return false;
	if (item.indexOf ('ù', 0) != -1) return false;
	if (item.indexOf ('ö', 0) != -1) return false;
	if (item.indexOf ('õ', 0) != -1) return false;      
	if (item.indexOf ('ô', 0) != -1) return false;      
	if (item.indexOf ('ó', 0) != -1) return false;      
	if (item.indexOf ('ò', 0) != -1) return false;      
	if (item.indexOf ('ñ', 0) != -1) return false;      
	if (item.indexOf ('ð', 0) != -1) return false;      
	if (item.indexOf ('ï', 0) != -1) return false;      
	if (item.indexOf ('î', 0) != -1) return false;         
	if (item.indexOf ('ë', 0) != -1) return false;            
	if (item.indexOf ('ê', 0) != -1) return false;            
	if (item.indexOf ('ç', 0) != -1) return false;
	if (item.indexOf ('ÿ', 0) != -1) return false;
	if (item.indexOf ('ÿ', 0) != -1) return false;
	if (item.indexOf ('ý', 0) != -1) return false;
	if (item.indexOf ('ý', 0) != -1) return false;

   return true;
}

function checkForm(){
   errfound = false;

if (!ValNull(document.shop.author.value)){
   window.alert("Inserisci il tuo nome!");
   document.shop.author.focus();
   return false;
   }

if (!NoChar(document.shop.author.value)){
   window.alert("NO HTML !!");
   document.shop.author.focus();
   return false;
   }

if (!ValNull(document.shop.ogg.value)){
   window.alert("Devi specificare l' oggetto.");
   document.shop.ogg.focus();
   return false;
   }

if (!NoChar(document.shop.ogg.value)){
   window.alert("NO HTML !!");
   document.shop.ogg.focus();
   return false;
   }

if (!NoChar(document.shop.sc.value)){
   window.alert("NO HTML !!");
   document.shop.sc.focus();
   return false;
   }
   
 if (!ValNull(document.shop.email.value)){
   window.alert("Inserisci un indirizzo e-mail.");
   document.shop.email.focus();
   return false;
   }

if (!ValidEmail(document.shop.email.value)){
   window.alert("L'e-Mail inserita non e’ corretta.");
   document.shop.email.focus();
   return false;
     }

if (!ValNull(document.shop.des.value)){
   window.alert("Inserisci una breve descrizione dell' oggetto!!");
   document.shop.des.focus();
   return false;
   }

if (!NoChar(document.shop.des.value)){
   window.alert("NO HTML !!");
   document.shop.des.focus();
   return false;
   }

if (!NoChar(document.shop.cell.value)){
   window.alert("NO HTML !!");
   document.shop.cell.focus();
   return false;
   }

if (!ValNull(document.shop.prov.value)){
   window.alert("Devi inserire il nome della tua provincia!!");
   document.shop.prov.focus();
   return false;
   }

if (!NoChar(document.shop.prov.value)){
   window.alert("NO HTML !!");
   document.shop.prov.focus();
   return false;
   }
}