[Webtest] button in a table

["Früchtenicht, Gabriele"]

hi, 

is there any chance to locate a submit-button in a table?
I always get the error message:

BUILD FAILED
Test step clickbutton named "Login Button clicken" failed with message "No
such parameter
in form: UserID"

<form name="myform" method="POST" action="j_security_check">
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TBODY>
      <TABLE class=formTabelle cellSpacing=0 cellPadding=0 border=0>
        <TBODY>
        <TR class=hintergrundHell>
          <TD colSpan=5>
            <TABLE class=rahmenOben width="100%">
              <TBODY>
              <TR>
                <TD><IMG class=labelFeldAbstand height=1
                  src="/spaka/transparent.gif"></TD>
                <TD align=middle width="100%"><INPUT name="Login"
class=MPButton type=submit value=Login ></TD>
                <TD><IMG class=labelFeldAbstand height=1
 
src="/spaka/transparent.gif"></TD></TR></TBODY></TABLE></TD></TR></TBODY></T
ABLE></TD>
    <TD width="5%"><IMG src="/spaka/transparent.gif"
  width=100></TD></TR></TBODY></TABLE>
  </form>

thanks,
gabi