show code
<form>
<textarea></textarea>
</form>
<script>
$('textearea').keypress(function (e) {
if (e.keyCode == 9) {
var myValue = "\t";
var startPos = this.selectionStart;
var endPos = this.selectionEnd;
var scrollTop = this.scrollTop;
this.value = this.value.substring(0, startPos) + myValue + this.value.substring(endPos,this.value.length);
this.focus();
this.selectionStart = startPos + myValue.length;
this.selectionEnd = startPos + myValue.length;
this.scrollTop = scrollTop;
e.preventDefault();
}
});
</script>