Error with OR - Operator

Hi!

The OR Operator doesn't work any more. There is a small error at line 76:

if ($upper_value == 'OR' || $filter['operator'] == 'OR') {
  $sqlop = ' OR ';
  continue;
}

this would mean, ever time I use the OR Operator, the condition gets true (because of the or ||) and the typed word doen't get added to the where clause.
if the $filter['operator'] gets removed, all works fine.

I added a small patch ;)