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Your input type=image is not a form submission type, so you need to tell it to submit the form, using javascript or something. The input type=submit has that functionality already built in.
Try something like this:
<input type="image" src="send.gif" name="submit" onclick="javascript:document.frmFormName.submit();" />
the javascript command in onclick tells the browser the purpose of this specific input is to submit the form. (BTW, change frmFormName to match your form name or id).