function fn_zapisz() {
     var luczen = document.getElementById('luczen').value ;
     var lprzed = document.getElementById('lprzed').value ;
     var dane = new Array();
     var result = new Array();
     for ( var i1=0; i1<luczen; i1++ ) {
       i11 = i1+1;
       id_u = 'u'+i11 ;
       dane[i1] = new Array() ; 
       dane[i1][0]  = document.getElementById(id_u).innerHTML ;
       //alert(dane[i1][0]);
       txt = (dane[i1][0]).toString() ;
       for ( var i2=0; i2<lprzed; i2++ )
         {
          id_p = dane[i1][0].toString()+'_'+(i2).toString() ;
          i3 = i2+1 ;
          dane[i1][i3] = document.getElementById(id_p).innerHTML ;
          txt += ':'+(dane[i1][i3]).toString() ;
         } 
     result.push (txt) ;    
     }
     
     json_data = JSON.stringify(result);
     var param = "data=" + encodeURIComponent(json_data) ;
     http_request = new XMLHttpRequest(); }
     http_request.onreadystatechange = Response;
     url="portal_zapisz.php" ;
     now = new Date();
     url = url + '?time=' + now.getTime() ;
     http_request.open('POST', url, true);
     http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
     http_request.setRequestHeader("Content-length", param.length);
     http_request.send(param);       
 }  
 
function Response() { 
   if (http_request.readyState == 4) {
     var result = http_request.responseText;
     document.getElementById('ok').innerHTML = result ;
   }
 }