/**
* Insert a tab at the current text position in a textarea
* Jan Dittmer, jdittmer@ppp0.net, 2005-05-28
* Inspired by http://www.forum4designers.com/archive22-2004-9-127735.html
* Tested on: 
*   Mozilla Firefox 1.0.3 (Linux)
*   Mozilla 1.7.8 (Linux)
*   Epiphany 1.4.8 (Linux)
*   Internet Explorer 6.0 (Linux)
* Does not work in: 
*   Konqueror (no tab inserted, but focus stays)
*/
function insertTab(event,obj) {
	var tabKeyCode = 9;

	if (event.which) // mozilla
		var keycode = event.which;
	else // ie
		var keycode = event.keyCode;

	if (keycode == tabKeyCode) {
		if (event.type == "keydown") {
			if (obj.setSelectionRange) {
				// mozilla
				var s = obj.selectionStart;
				var e = obj.selectionEnd;
				obj.value = obj.value.substring(0, s) + "\t" + obj.value.substr(e);
				obj.setSelectionRange(s + 1, s + 1);
				obj.focus();
			} else if (obj.createTextRange) {
				// ie
				document.selection.createRange().text="\t"
				obj.onblur = function() { this.focus(); this.onblur = null; };
			} else {
				// unsupported browsers
			}
		}
		if (event.returnValue) // ie ?
			event.returnValue = false;
		if (event.preventDefault) // dom
			event.preventDefault();
		return false; // should work in all browsers
	}

	return true;
}