how-to click javascript button - and debug noob questions

Source:
<a
href="javascript:document.__main.__cmdfunc.value='launchPage()';document.__main.submit();"
class="button"><img src="images/start-my-page.jpg"/></a>

Contains a href to a javascript function, has an image as a clickable
element.
I'm trying to trigger the click by an image reference:
ie.button(:src, /start-my-page/).click

but I exit and get a "1" return code.
Questions:
1) What is the correct means to click this image?
2) Is there a way to get a more meaningful error than simply a return
code of 1?