function clientSideInclude(id, url) {

  var req = false;
  // For Safari, Firefox, and other non-MS browsers
  if (window.XMLHttpRequest) {
    try {
      req = new XMLHttpRequest();
    } catch (e) {
      req = false;
    }
  } else if (window.ActiveXObject) {
    // For Internet Explorer on Windows
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        req = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) {
        req = false;
      }
    }
  }
 var element = document.getElementById(id);
 if (!element) {
/*
  alert("Bad id " + id +
   "passed to clientSideInclude." +
   "You need a div or span element " +
   "with this id in your page.");
*/
  return;
 }
  if (req) {
    // Synchronous request, wait till we have it all
    req.open('GET', url, false);
    req.send(null);
    element.innerHTML = req.responseText;
  } else {
    element.innerHTML =
   "Sorry, your browser does not support " +
      "XMLHTTPRequest objects. This page requires " +
      "Internet Explorer 5 or better for Windows, " +
      "or Firefox for any system, or Safari. Other " +
      "compatible browsers may also exist.";
  }

}
//loadingpages
var vurls = new Array();
var vtexts = new Array();

function clearpage() {vurls.shift();vtexts.shift();}

function filtr(url) {

url = this.String(url);
url = url.replace(/"/g,"");
url = url.replace(/'/g,"");
url = url.replace(/\n/g,":::enter:::");  

return url;
}

function rempage(url, id){vurls.push(url);vtexts.push(document.all[id].innerHTML);setTimeout("clearpage()", 1000 * 60 * 10);;};
function loadpage(id, url) {
mypage="";

for (k=0;k<=100;k++) {if (vurls[k] == url) {mypage=vtexts[k]; } ;}

if (mypage.length > 0) { document.all[id].innerHTML=mypage; ;} 
else { 
document.all[id].innerHTML="<center><img style=position:relative;top:150 src=fots/loadanim.gif></center>";
url = filtr(url);
setTimeout("clientSideInclude(\""+ id + "\", \"" + url + "\"); rempage(\"" + url + "\", \"" + id + "\");", 450);
};}

function loadpage2(id, url) {
mypage="";

for (k=0;k<=100;k++) {if (vurls[k] == url) {mypage=vtexts[k]; } ;}

if (mypage.length > 0) { document.all[id].innerHTML=mypage; ;} 
else { 
document.all[id].innerHTML="<center><img src=fots/loadanim.gif width:40></center>";
url = filtr(url);
setTimeout("clientSideInclude(\""+ id + "\", \"" + url + "\"); rempage(\"" + url + "\", \"" + id + "\");", 450);
};}

function getpageanim(id, url) {
document.all[id].innerHTML="<center><img src=fots/loadanim.gif width:40></center>";
url = filtr(url);
setTimeout("clientSideInclude(\""+ id + "\", \"" + url + "\");", 450);;}

function getpageanim2(id, url) {
document.all[id].innerHTML="<center><img style=position:relative;top:150 src=fots/loadanim.gif></center>";
url = filtr(url);
setTimeout("clientSideInclude(\""+ id + "\", \"" + url + "\");", 450);;
}


function getpage(id, url) {url = filtr(url);clientSideInclude(id, url);}


function checkPESEL(str) {

if (str.length == 11) {

wynik = str.substr(0,1) * 1;
wynik = wynik + str.substr(1,1) * 3;
wynik = wynik + str.substr(2,1) * 7;
wynik = wynik + str.substr(3,1) * 9;
wynik = wynik + str.substr(4,1) * 1;
wynik = wynik + str.substr(5,1) * 3;
wynik = wynik + str.substr(6,1) * 7;
wynik = wynik + str.substr(7,1) * 9; 
wynik = wynik + str.substr(8,1) * 1;
wynik = wynik + str.substr(9,1) * 3;
wynik = wynik + str.substr(10,1) * 1;
if (wynik%10 == 0) {return true;} else {return false;};


} 

else {return false;}

}


function formChkActiveElements(formName)
{
var str = '';
var elem = document.getElementById(formName).elements;
for(var i = 0; i < elem.length; i++)
{
if (elem[i].type == 'checkbox') {
if (elem[i].checked) {str += elem[i].name + ","}
} //if
}


return str;

}

function loferta(){loadpage('tresc','pages/oferta.html');}
function lkadra(){loadpage('tresc','getmpage.php?page=lista_pracownikow');}
function ldyzury(){loadpage('tresc','getmpage.php?page=dyzury');}
function lstudenci(){loadpage('tresc','getmpage.php?page=studenci');}