Search Webpage for ID of Image

I need to scan a webpage to see whether or not there is an image on the webpage. I have the id of the image which is "apples", and I want the program to search the webpage for the image, and if it is not found, to go onto the next thing (which would be to start timer2).

I am not sure how I could do this and any help would be much appreciated.

Here is what I have come up with so far, its not much but it was all I knew:

Code:

---

Dim cap As String = WebBrowser1.Document.GetElementById("apples").GetAttribute("src")
 If cap = Nothing Then
            Timer2.Start()
        Else
            Msgbox("The Apples were found!")

        End If

---

Bump:

Any one, please.