Problems with using an image in a submit button

[b2b2u]

I must be having a major melt down.

I can't seem to get a form to submit using an image !?

<input type="image" src="submit.gif ">

Any body have this problem? Or am I just getting bleery eyed and doing
something dumb?

code below works (truncated)

<form name="loginForm " action="/index.cfm" method="post"
onSubmit="retur n
checkTheForm()" >
<input type="submit" value="GO" name="login" class="go">
</form>

but this code doesn't:

<input type="image" name="login" src="/graphics/go.gif">

!????!!!!

Does it have anything to do with the x/y values being submitted? If so
what can I do about it?

-- gil