while ( object != null ) { if ( object == constructor.prototype ) { return true; } object = object.__proto__; } return false; 
return object instanceof constructor; 
function InstanceOf( object, constructor ) {    while ( object != null ) {        if ( object == constructor.prototype ) {            return true;        }        object = object.__proto__;    }    return false;}
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/d344e75c45fbc503af4360badf0851ccb55581f1/proto_10.js/buggy/js/tests/js1_3/inherit/proto_10.js