Using multiple images as submit buttons

I have this form with 2 images as submit buttons

• <INPUT TYPE="image" SRC="assets/images/lgstart_b.png" ALT="Submit Form" name="time_in">
• <INPUT TYPE="image" SRC="assets/images/lgstop_bo.png"   ALT="Submit Form" name="time_out">

The problem is I can tget the next page to acknowldge either button. I am using CF9

Here is the form2.cfm page

<cfif IsDefined("FORM.time_in.X")>

TIME IN

<cfelseif IsDefined("FORM.time_out.X")>

TIME OUT

<cfelse >

Nothing

</cfif>

I get an 'undefined' message only

I know I have done this before what am I missing?

Here is the form with the  2 images as submit buttons

<form action="form2.cfm" method="post"> 

         <table cellpadding="0" cellspacing="5">

            <tr>

              <td align="center" class="crewlist_time"><strong>Status</strong></td>

            </tr>

            <cfoutput query="get_employees">

              <tr>

                <td width="20" align="left"><input type="checkbox"  checked name="Employee_ID" value="#Employee_ID#"/></td>

                <td class="crewlist_cell"> #EMPLOYEE_NAME# </td>

               <div class="clock">

            <div class="clockin">Clock In</div>

        <INPUT TYPE="image" SRC="assets/images/lgstart_b.png"   ALT="Submit Form" name="time_in">

        </div>

          <div class="clockrt">

            <div class="clockin">Clock Out</div>

              <INPUT TYPE="image" SRC="assets/images/lgstop_bo.png"   ALT="Submit Form" name="time_out">

             </div>

        </div></cfoutput>

        <br>

        <br>

        </form>