Issue with IE Management - unable to click on image

[VeeDub]

Hello,

I'm trying to click on the first 'Go' image on this site http://www.privateschoolsdirectory.com.au

The code that I'm using is:

If ProcessExists("iexplore.exe") Then
$oIE = _IEAttach("The Private Schools Directory")
$Status = _IEImgClick($oIE,"images/goBtn.gif","src")
If $Status <> -1 Then
MsgBox(0,"Error - Go",@error)
EndIf
EndIf

The _IEImgClick fails with

--> IE.au3 V2.4-0 Warning from function _IEImgClick, $_IEStatus_NoMatch

I know that the image source is correct.

I'm wondering if the issue is that there is more than one 'Go' image on the page. I've tried using different indexes: 0, 1, 2 but that hasn't made any difference.

Suggestions on how to troubleshoot would be appreciated