Form with image as button

[mattalexx]

Why is my form:

<form name="helpupd" method="post" action="admin.asp?tblname=tblNewBooks&page=1">

not working when I use an image submit button?:

<input type="submit" name="updhelp" src="images/sq_less.gif">

The form works perfectly when I use a regular submit button instead:

<input type="submit" name="updhelp">

Here's the whole form (the version with an image that's not working):

<form name="helpupd" method="post" action="admin.asp?tblname=tblNewBooks&page=1">
        <input type="hidden" name="dishelp" value="0">
        <input type="submit" name="updhelp" src="images/sq_less.gif">
</form>

Thanks guys.