function addLoadEvent(func) { 
    var oldonload = window.onload; 
    if (typeof window.onload != 'function') { 
        window.onload = func; 
    } else { 
        window.onload = function() { 
            if (oldonload) { 
                oldonload(); 
            } 
            func(); 
        } 
    } 
} 

addLoadEvent(OpenAdsInit); 

function OpenAdsInit(){
    for(var i=0;i<document.getElementsByTagName("a").length;i++) {
        var link = document.getElementsByTagName("a")[i];
        if (link.getAttribute("rel") && link.getAttribute("rel")=="advertising"){  
            link.onclick = openInNewWindow;
        }
    }
}

function openInNewWindow() {
    window.open(this.href);
    return false;
}