Submit buttons not working

I am replacing button images with simple buttons to make things easier. Using classic ASP

This is an image that works as a button, when clicked it submits a form with certain parameters:

       <input name="imageField" type="image" onClick="document.form1.action='Emailforms.asp?caseid=<%=(Casesjoin.Fields.Item("Id").Value)%>'" src="../../../Images/Buttons/BtEmailForms.gif" width="84" height="20" border="0">

The above works great, form is submitted, I am replacing with a form button with the same action, but the form button doesnt work, is there something wrong in the syntax ?

 <input name="imageField" type="button" class="bodytext" id="imageField" onClick="document.form1.action='Emailforms.asp?caseid=<%=(Casesjoin.Fields.Item("Id").Value)%>'" value="    Email Forms    ">