document.forms[0] has no elements in debug mode

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ASP.NET

Hi,
I am new to ASP.NET and has an issue like this.

I have a form with a table. I have an image in in one of the . I want to change this dynamically on a button click event. I have a javascript function to do this:

function showGraph(url)
{
    var tdimage = document.getElementById("graphimage");//graphimage is the id of td in the table
    if(tdimage != null)
    {
        tdimage.setAttribute(src, url);
    }
}

But, when I click on the button and go to the debug view using VS2008, I don't see any controls in my form except __EVENTTARGET, __EVENTARGUMENT and __VIEWSTATE. What happened to the table that I have added??