Get name of javascript method associate with

Question

I write a program get Html Document from Internet and parse it. I use code like:

HtmlDocument html = webbrowser1.Document;

HtmlElementCollection tags = html.getElementsByTagName("td")

I want to retreive the name of the javascript method associating with a <a> like: <td><a onclick = "javascipt:doSomeThing();"></a></td>. But, tags(1).firstChild.getAttribute("onclick") return System._COMObject, not the javascript function name. So, how can I get the javascript function name?