Question : alternate state subit button

Hi,
I have just finished creating a graphical submit button, with an on and off state.  But I am struggling to find some simple coding to make it 'click' as someone clicks on the submit button.

Can anyone point me in the right direction?

Answer : alternate state subit button

then in place of onmouseover put onclick....

<input type="image" src="images/submit.png" name="Submit" width="68" height="68" border="0" id="envirosign" onmouseout="MM_swapImgRestore()" onclick="MM_swapImage('envirosign','','images/submit_on.png',1)" />

and if you dont want to retain the old status then remove the onmouseout part


<input type="image" src="images/submit.png" name="Submit" width="68" height="68" border="0" id="envirosign" onclick="MM_swapImage('envirosign','','images/submit_on.png',1)" />