document.getElementById('OBJECT ID').addEventListener('keydown', function(clickevent) {
        if (clickevent.key=='Tab') {
            var begin = this.selectionStart;
            var e = this.selectionEnd;
            this.value = this.value.substring(0, begin)+"\t"+this.value.substring(e);
            this.selectionStart = this.selectionEnd = begin+1;
            clickevent.preventDefault();
        }
});