// JavaScript Document
function checkForm()
{
	
	
	counter = 0;
	index = document.getElementById("esp").selectedIndex;
	choice1 = document.getElementById("esp").options[index].value;
	if (choice1 == "") {
		counter++;
	}
	
	index = document.getElementById("prov").selectedIndex;
	choice2 = document.getElementById("prov").options[index].value;
	if (choice2 == "") {
		counter++;	
	}
	
	index = document.getElementById("esp1").selectedIndex;
	choice3 = document.getElementById("esp1").options[index].value;
	if (choice3 == "") {
		counter++;
	}
	
	index = document.getElementById("tipo").selectedIndex;
	choice4 = document.getElementById("tipo").options[index].value;
	if (choice4 == "") {
		counter++;
	}
	
	index = document.getElementById("metri").selectedIndex;
	choice5 = document.getElementById("metri").options[index].value;
	if (choice5 == "") {
		counter++;
	}
	
	index = document.getElementById("metri").selectedIndex;
	choice6 = document.getElementById("metri").options[index].value;
	if (choice6 == "") {
		counter++;
	}
	
	if (counter == 6) {
		alert("Devi selezionare almeno un campo per eseguire la ricerca");	
		return false;
	}
	
	return true;
}