Merge branch issue#170 with dev

Update to tx_nG6_pi1.js

The ajax return codes (0,1,2 and 3) cannot be evaluated as strings. "if (val == '1') {" becomes "if (val == 1) {" .

Warning : We could also leave this file as it is, and make sure the value returned in AJAX is a String. I'm not sure if it is the best solution!

issue #170 (closed)