function getValueForPath(xpath)
{
	return document.evaluate(xpath, document, null, XPathResult.ANY_TYPE, null).stringValue;
}
if(document.evaluate("boolean(//@class='button buy-button')",  document, null, XPathResult.ANY_TYPE, null).booleanValue){
	try {
		var pId = getValueForPath("string(//div[@class='pd-textouter'])").split(" ")[0].match(/\d+/)[0].trim();				
		var pixelUrl = "//px.adadyn.com/dpx?px_id=119&type=2&adv_id=35&section=3&pid=" + pId;
		var ozDiv = document.createElement("div");
		ozDiv.innerHTML = "<iframe src='" + pixelUrl + "' width=1 height=1 />"; 
		document.getElementsByTagName('body')[0].appendChild(ozDiv);
		}catch(err){		
	}	
}