function showdoc(formname,selectname,mydiv){
    var myselect = document.getElementById(selectname);
    var myindex = myselect.selectedIndex;
    var teacher_id = myselect.options[myindex].value;
     var page='doc.php?teacher_id=' + teacher_id;
     getData(page,mydiv)
 }

var myobject = false;
if(window.XMLHttpRequest){
    myobject = new XMLHttpRequest();
}else if(window.ActiveXObject){
    myobject = new ActiveXObject("Microsoft.XMLHTTP");
}

function getData(dataSource,divid){
    if(myobject){
    var obj = document.getElementById(divid);
    myobject.open("GET", dataSource);

    myobject.onreadystatechange = function(){
        if(myobject.readyState == 4 && myobject.status == 200){
            obj.innerHTML = myobject.responseText;
        }
    }
        myobject.send(null);
    }
}

function show(id){
    obj = document.getElementById(id);
    obj.style.display = 'inline';
}

function hide(id){
    obj = document.getElementById(id);
    obj.style.display = 'none';
}

function ismaxlength(obj){
    var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : ""
    if (obj.getAttribute && obj.value.length>mlength)
    obj.value=obj.value.substring(0,mlength)
}


function makeHttpRequest(url, callback_function, return_xml)
{
   var http_request = false;

   if (window.XMLHttpRequest) { // Mozilla, Safari,...
       http_request = new XMLHttpRequest();
       if (http_request.overrideMimeType) {
           http_request.overrideMimeType('text/xml');
       }

   } else if (window.ActiveXObject) { // IE
       try {
           http_request = new ActiveXObject("Msxml2.XMLHTTP");
       } catch (e) {
           try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
           } catch (e) {}
       }
   }

   if (!http_request) {
       //alert('Unfortunatelly you browser doesn\'t support this feature.');
       return false;
   }
   http_request.onreadystatechange = function() {
       if (http_request.readyState == 4) {
           if (http_request.status == 200) {
               if (return_xml) {
                   eval(callback_function + '(http_request.responseXML)');
               } else {
                   eval(callback_function + '(http_request.responseText)');
               }
           } else {
               //alert('There was a problem with the request.(Code: ' + http_request.status + ')');
           }
       }
   }
   http_request.open('GET', url, true);
   http_request.send(null);
}

function loadBanner(xml)
{
    
    var html_content = xml.getElementsByTagName('content').item(0).firstChild.nodeValue;
    var reload_after = xml.getElementsByTagName('reload').item(0).firstChild.nodeValue;  
    document.getElementById('ajax-banner-top').innerHTML = html_content;

    setTimeout("nextTopAd()", parseInt(reload_after));


}

function nextTopAd()
{
    var now = new Date();
    var url = 'ads_top.php?ajaxreq=true&ts=' + now.getTime();
    makeHttpRequest(url, 'loadBanner', true);
}




function loadRightBanner(xml)
{
    



}

function nextRightAd()
{
    var now = new Date();
    /*makeHttpRequest(url, 'loadRightBanner', true);*/
    $.ajax({
      url: 'ads_right.php?ajaxreq=true&ts=' + now.getTime(),
      success: function(data) {
        $('#ajax-banner-right').html(data);


        setTimeout("nextRightAd()", 15000);
      }
    });
}



function timeAds(){
    setTimeout("nextTopAd()", 15000);
    setTimeout("nextRightAd()", 15000);
}
window.onload = timeAds;