Servlets :: Submit Buttons In JSP File

A user can dislike/like a topic. However I have to submit buttons in my jsp file, the issue is that when a user presses like/dislike it should print out on the consile line. It does that perfectly but it prints out both when it should only print out either like or dislike.

My JSP code:

<form name = "ViewTripServlet" action="ViewTripServlet" method="post">

</br>
</br>
</br>
<input type="image" name = "like" value="submit" src=images/like.png onMouseOver="this.src='images/like.png'">
</br>
</br>
</br>
<input type="image" name = "dislike" value="submit" src=images/dislike.png onMouseOver="this.src='images/dislike.png'">

</form>

Servlet Code:

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ViewTri vT = new ViewTrip();
vT.user_like(request.getParameter("like"));

vT.user_dislike(request.getParameter("dislike"));

[code]....