function formCheck(formobj){
    
    var fieldRequired = Array( "o_uebern", "o_name", "o_mail", "o_termin", "o_zahl" );
    
    var fieldDescription = Array( "Nazwa hotelu, pensjonatu, kwatery", "Imie i Nazwisko", "e-mail", "Planowany termin urlopu. (od - do)", "Planowana ilosc osob." );
    
    var alertMsg = "Prosze o dokladne wypelnienie pol:                       \n\n";
    
    var l_Msg = alertMsg.length;
    
    
    for (var i = 0; i < fieldRequired.length; i++){
        var obj = formobj.elements[fieldRequired[i]];
        if (obj){
            switch(obj.type){
            case "select-one":
                if (obj.selectedIndex == -1 || obj.options[obj.selectedIndex].text == ""){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                break;
            case "select-multiple":
                if (obj.selectedIndex == -1){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                break;
            case "text":
            case "textarea":
            
            String.prototype.trim = function() {
            // Delete leading and trailing whitespace
            // and return everything in between
              var x=this;
              x=x.replace(/^\s*(.*)/, "$1");
              x=x.replace(/(.*?)\s*$/, "$1");
              return x;
            }
            var s = obj.value;
            
                if (s.trim() == "" || s.trim() == " " || obj.value == null){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                break;
            default:
            }
            if (obj.type == undefined){
                var blnchecked = false;
                for (var j = 0; j < obj.length; j++){
                    if (obj[j].checked){
                        blnchecked = true;
                    }
                }
                if (!blnchecked){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
            }
        }
    }

    if (alertMsg.length == l_Msg){
        return true;
    }else{
        alert(alertMsg);
        return false;
    }
}