function hideOverlay()
{
	document.getElementById('overlay').style.display = 'none';
}

function showOverlay()
{
	var p = getPageSize();
	document.getElementById('overlay').style.height = (p[3] - 71) + "px";
	document.getElementById('overlay').style.display = '';
}

function showAd(src, w, h)
{
	//alert('showAd');
	CreateControl('overlayContent', 'd27cdb6e-ae6d-11cf-96b8-444553540000', 'flashAd', w, h, src, true);
	showOverlay();	
}

function clearAd()
{
	hideOverlay();
	document.getElementById('overlayContent').innerHTML = '';
}

function CreateControl(DivID, CLSID, ObjectID,
                       WIDTH, HEIGHT, URL, AUTOSTART, BASE)
{
  var d = document.getElementById(DivID);
  
  if (!BASE || BASE == "")
  {
  	BASEPARAM = "";
 	BASEEXTRA = "";
  } else {
  	BASEPARAM = '<param name="base" value="' + BASE + '">';
  	BASEEXTRA = ' base="' + BASE + '" ';
  }
  
  d.innerHTML = 
    '<object ' + BASEEXTRA + ' classid="clsid:' + CLSID + '" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,0,0" width="' + WIDTH + '" height="' + HEIGHT + '" align="middle">' + 
            '<param name="allowScriptAccess" value="always" />' + 
            '<param name="movie" value="' + URL + '" />' +
            '<param name="quality" value="high" />' +
            '<param name="bgcolor" value="#ffffff" />' +
            BASEPARAM + 
            '<embed ' + BASEEXTRA + ' src="' + URL + '" quality="high" bgcolor="#ffffff" width="' + WIDTH + '" height="' + HEIGHT + '" align="middle" allowscriptaccess="always" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /></embed>' +
        '</object>';
}