cannot call servlet using onclick

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JSP

servlet

this is my submit button..

i want to use other servlet for handling this servlet

<input type="submit" name="adddir" value="submit" onclick='form.action="addfolder"'/>

here it can call a .jsp page but it cannot handle servlet

<input type="submit" name="adddir" value="submit" onclick='form.action="login_ml.jsp"'/>