var doc = browser.Document as HTMLDocument;

if (doc != null)
{
    //Create the sctipt element 
    var scriptErrorSuppressed = (IHTMLScriptElement)doc.createElement("SCRIPT");
    scriptErrorSuppressed.type = "text/javascript";
    scriptErrorSuppressed.text = m_disableScriptError;
    //Inject it to the head of the page 
    IHTMLElementCollection nodes = doc.getElementsByTagName("head");
    foreach (IHTMLElement elem in nodes)
    {
        var head = (HTMLHeadElement)elem;
        head.appendChild((IHTMLDOMNode)scriptErrorSuppressed);
    }
}