var xmlhttp

function getParamValue(param,url)
{
    var u = url == undefined ? document.location.href : url;
    var reg = new RegExp('(\\?|&|^)'+param+'=(.*?)(&|$)');
    matches = u.match(reg);
    return matches[2] != undefined ? decodeURIComponent(matches[2]).replace(/\+/g,' ') : '';
}

function showImage(str)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Votre navigateur ne supporte pas AJAX!");
  return;
  }
var url="/portals/20/js/getimage.asp";
url=url+"?q="+getParamValue('VideoId');

xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
if (xmlhttp.readyState==4)
  {
  //lert(xmlhttp.responseText);
  document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
  }
}

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}