function checkHotel() {
    var select= document.getElementById("selectHotel");

    if(select.selectedIndex==0) {
        alert("Select your hotel");
        return false;
    } else return true;
}

function changeAction(select) {
    if (select.selectedIndex>2) {
        document.getElementById("form").action="http://www.bookin1.com/html/new_stage1.jsp";
    } else {
        document.getElementById("form").action="http://www.bookin1.com/portal/in1.jsp";
    }
}