[Javascript] checkboxes in array

[Michael Borchers]

typ 1:<input type="checkbox" name="typ[]" value="1"> stck 1:<input type="text" name="stck[]" value="4"><br>
typ 2:<input type="checkbox" name="typ[]" value="2"> stck 2:<input type="text" name="stck[]" value="0"><br>
typ 3:<input type="checkbox" name="typ[]" value="3"> stck 3:<input type="text" name="stck[]" value="5"><br>

when someone focusses on a text input (stck) i would like the responding checkbox to be checked.
possible?!