// JavaScript Document
function checkForm()
{
	counter = 0;
	
	index = document.getElementById("esp").selectedIndex;
	field1 = document.getElementById("esp").options[index].value;
	if (field1 == "") {
		counter++;
	}
	
	index = document.getElementById("prov").selectedIndex;
	field2 = document.getElementById("prov").options[index].value;
	if (field2 == "") {
		counter++;	
	}
	
	index = document.getElementById("esp1").selectedIndex;
	field3 = document.getElementById("esp1").options[index].value;
	if (field3 == "") {
		counter++;
	}
	
	index = document.getElementById("tipo").selectedIndex;
	field4 = document.getElementById("tipo").options[index].value;
	if (field4 == "") {
		counter++;
	}
	
	index = document.getElementById("metri").selectedIndex;
	field5 = document.getElementById("metri").options[index].value;
	if (field5 == "") {
		counter++;
	}
	
	index = document.getElementById("prezzo").selectedIndex;
	field6 = document.getElementById("prezzo").options[index].value;
	if (field6 == "") {
		counter++;
	}
	
	if (document.getElementById("ext_field")) {
		index = document.getElementById("ext_field").selectedIndex;
		ext_field = document.getElementById("ext_field").value;
		if (ext_field == "") {
			counter++;
		}
	}
	
	if (counter == 6 || counter == 7) {
		alert("Devi selezionare almeno un campo per eseguire la ricerca");
		return false;
	}
	
	return true;
}