function valid(){
var ing_principale=document.theform.ing_principale.value;
if (ing_principale==""){
alert("Devi indicare un ingrediente!")
document.theform.ing_principale.focus()
return false
	}
var ing_principale=document.theform.ing_principale.value;
if (ing_principale=="Scrivi Ingrediente"){
alert("Devi indicare un ingrediente!")
document.theform.ing_principale.focus()
return false
	}
}