var xmlHttp = false;
try {
  xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
  try {
    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  } catch (e2) {
    xmlHttp = false;
  }
}
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
  xmlHttp = new XMLHttpRequest();
}
function callServer( page )
{
        var url = "server/content_tab.php?" + page;
        xmlHttp.open("GET", url, true);
        xmlHttp.onreadystatechange = updatePage;
        xmlHttp.send(null);
}
function updatePage()
{
        if (xmlHttp.readyState <= 3) {
        document.getElementById("zagruz").innerHTML = '<div style="width: 92px; height: 92px; background-image: url(images/all_loading.gif);"></div>';
                                     }
        if (xmlHttp.readyState == 4) {
        var response = xmlHttp.responseText;
        document.getElementById("content").innerHTML = response;
        document.getElementById("zagruz").innerHTML = '';
                                     }
}