function updateImage(url)
{
    xmlHttp=GetXmlHttpObject();

    if (xmlHttp==null)
    {
        alert ("Browser does not support HTTP Request");
        return;
    }

    xmlHttp.onreadystatechange=updateSpectrumImage;
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
}

function updateSpectrumImage() {
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
    {
    		var resonse = xmlHttp.responseText;
				var begin=resonse.indexOf('<div');
				var end=resonse.indexOf('</div>')

    		document.getElementById("spectrumAd").innerHTML=resonse.substring(begin,end+6);
    }
}

function GetXmlHttpObject()
{
    var objXMLHttp=null;
    if (window.XMLHttpRequest)
    {
        objXMLHttp=new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
        objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    return objXMLHttp;
}