var msg_src = "";

function SearchTrip() {
    if (document.getElementById("formHeader_SrcDestinazione").value == "" && document.getElementById("formHeader_SrcTipologia").value == 0) {
        alert(msg_src);
        return;
    }
    
    if (document.getElementById("formHeader_SrcTipologia").value == 0) {
        param = "?DES=" + document.getElementById("formHeader_SrcDestinazione").value;
    }
    else {
        if (document.getElementById("formHeader_SrcDestinazione").value == "") {
            param = "?TIP=" + document.getElementById("formHeader_SrcTipologia").value;
        }
        else {
            param = "?TIP=" + document.getElementById("formHeader_SrcTipologia").value;
            param = param + "&DES=" + document.getElementById("formHeader_SrcDestinazione").value;
        }
    }
    window.location = "Cerca.aspx" + param;
}