function cover_style (nmb)  {
    icover = document.getElementById("divCover");   
	  icover_cont = document.getElementById("cover_cont"); 
	  icover_cont.style.display = "none";
	  if(nmb==3) {
	     icover.style.background = "url(images/cover"+nmb + ".gif)";
	  }
	  else {
	     icover.style.background = "url(images/cover"+nmb + ".jpg)";
	  }
}		

function makeInstance(url) {
    var httpRequest;

    if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        httpRequest = new XMLHttpRequest();
        if (httpRequest.overrideMimeType) {
            httpRequest.overrideMimeType('text/xml');
        }
    } 
    else if (window.ActiveXObject) { // IE
        try {
            httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
        } 
        catch (e) {
           try {
                httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
           } 
          catch (e) {}
        }
    }

    if (!httpRequest) {
        alert('Giving up :( Cannot create an XMLHTTP instance');
        return false;
    }
    
    httpRequest.onreadystatechange = function() { handleResponse(httpRequest); };
    httpRequest.open('GET', url, true);
    httpRequest.send('');
}
    
function handleResponse(httpRequest) {
  if (httpRequest.readyState == 4) {
      if (httpRequest.status == 200) {
         icover_cont = document.getElementById("cover_cont"); 
         icover_cont.style.display = "block";
         icover_cont.style.background  = 'url(images/empty.jpg)';
      	 //document.getElementById('cover_cont').style.background = 'url(images/empty.jpg)';
         document.getElementById("divLoadArea").innerHTML = httpRequest.responseText;
      } else {
          alert('There was a problem with the request.');
      }
  }
}