Pass form value from submit image

If you use a plain grey submit button (or buttons), you can pass a value reflecting which button has been clicked:

<input type="submit" name="test" value="Button one">
<input type="submit" name="test" value="Button two">

On the page the form takes you to;

Request.Form("test") will give you "Button one" or "Button two", dependant on which button you clicked.

However, if you use images not buttons:

<input type="image" name="test" value="one" src="image1.gif">
<input type="image" name="test" value="two" src="image2.gif">

These work as submit buttons, but annoyingly do not pass their assigned values.

Is there a way around this, as I really need to pass said value and really, really don't need to use a normal form button!

Hope this makes sense.

Ta