function checkInput(){
    var dst=get_object("cities").value;
    var chkin=$("#datepicker-in").datepicker('getDate');
    var chkot=$("#datepicker-out").datepicker('getDate');
    var msg="";
    var err=false;
    if(dst==""){
        err=true;
        msg+="\n\tDestination";
    }
    if(chkin==null){
        err=true;
        msg+="\n\tCheck in date";
    }
    if(chkot==null){
        err=true;
        msg+="\n\tCheck out date";
    }
    if(err){
        alert("The following is missing:"+msg);
        return false;
    }
    return true;
}