var currentPage = 0;
    var currentSort = "";
    var currentSortOrder = "ASC";
    var maxPage;
    var defaultTableData;
    
    function $(id) {
    
        return document.getElementById(id);
    }
    
    function parseRecords(xml) {

        with (xml.getElementsByTagName("records").item(0)) {
            page = getAttribute("page")*1;
            maxPerPage = getAttribute("max_per_page");
            startId = maxPerPage*page+1;
            total = getAttribute("total")*1;
            maxPage = Math.ceil(total/maxPerPage);
            $("dataStats").innerHTML = 
              "Rekordy: " + startId + " - " + (startId+getAttribute("count")*1-1) + " z " + total + " (Strona: " +
              (page+1) + " z " + maxPage + ")";
        }
        $("btnFirst").style.visibility = $("btnPrev").style.visibility = page == 0 ? "hidden" : "visible";
        $("btnLast").style.visibility = $("btnNext").style.visibility = page+1 == maxPage ? "hidden" : "visible";
        
        d = $("dataTable");
        for (i = d.rows.length-1; i >= 0; i--)
          d.deleteRow(i);
        record = xml.getElementsByTagName("record");
        result = "";
        for (i = 0; i < record.length; i++) {
            tr = document.createElement("tr");
            tr.style.backgroundColor = (i%2) ? "#CBDDFB" : "white" ;
            td = document.createElement("td");
            td.innerHTML = startId + i;
            tr.appendChild(td);
            for (j = 0; j < 3; j++) {
                td = document.createElement("td");
                td.innerHTML = record[i].childNodes[j].childNodes[0].nodeValue;
                tr.appendChild(td);
            }
            d.appendChild(tr);
        }
        return result;
    }
    
    function getRecords() {
    
        advAJAX.get({
            url : '/Doradcy_metodyczni/'+currentPage+','+currentSort+"%20"+currentSortOrder, 
            onInitialization : function() {

                $("dataStats").innerHTML = '<span style="font-weight: bold">Pobieranie danych...</span>';
                $("btnPrev").style.visibility = "hidden";
                $("btnNext").style.visibility = "hidden";
                $("btnFirst").style.visibility = "hidden";
                $("btnLast").style.visibility = "hidden";
            },
            onSuccess : function(obj) {

                parseRecords(obj.responseXML);
            }
        });
    }
    
    function changeSort(s) {
    
        if (currentSort == s)
        {
          currentSortOrder = currentSortOrder == "ASC" ? "DESC" : "ASC"; 

        }
        else 
        {
            currentSortOrder = "ASC";
            if (currentSort != "")
            {
              	/*$(currentSort + "Sort").style.fontWeight = "normal";*/
              	$(currentSort + "Kier").innerHTML=" ";
            }
          /*  $(s + "Sort").style.fontWeight = "bold";*/
        	
        }
		
               
        $(s+"Kier").innerHTML = (currentSortOrder == "ASC") ?"▲"  :"▼" ;
          
          	
          	
        currentSort = s;
        
        changePage(0);
    }
    
    function changePage(p) {
    
        currentPage += p;
        getRecords();
    }