nl_tokens: utility function for XHR
pl_tokens: function get_req ( ) { var self = this ; var req ; if ( window . XMLHttpRequest ) { <mask> { req = new XMLHttpRequest ( ) ; } catch ( e1 ) { req = false ; } } else if ( window . ActiveXObject ) { try { req = new ActiveXObject ( "Microsoft.XMLHTTP" ) ; } catch ( e2 ) { req = false ; } } return req ; }