[Chameleon] Error with explorer 5 nNavSubmit

[ventouse at free.fr]

Hi dear list !
I have a problem with my chameleon application. Every is going well with firefox
and explorer 6, but with explorer i can 't use any of the navbuttons (panmap,
query, ...).
Here is the error description :
In
"function NavSetActiveTool( oButton, aVals )"
error with
var nNavSubmit = (aVals[5] != undefined) ? aVals[5] : 1;
...
Explorer tells me that undefined is unknown...
Please help me !!

10x all