// From http://phpbb.com
var clientPC = navigator.userAgent.toLowerCase();
var clientVer = parseInt(navigator.appVersion);
var is_ie = ((clientPC.indexOf("msie") != -1) && (clientPC.indexOf("opera") == -1));
var is_nav = ((clientPC.indexOf('mozilla')!=-1) && (clientPC.indexOf('spoofer')==-1) && (clientPC.indexOf('compatible') == -1) && (clientPC.indexOf('opera')==-1) && (clientPC.indexOf('webtv')==-1) && (clientPC.indexOf('hotjava')==-1));
var is_moz = 0;
var is_win = ((clientPC.indexOf("win")!=-1) || (clientPC.indexOf("16bit") != -1));
var is_mac = (clientPC.indexOf("mac")!=-1);
var selectedInputArea;

function mozWrap(txtarea, open, close){
	var selLength = txtarea.textLength;
	var selStart = txtarea.selectionStart;
	var selEnd = txtarea.selectionEnd;
	if (selEnd == 1 || selEnd == 2) selEnd = selLength;
	var s1 = (txtarea.value).substring(0,selStart);
	var s2 = (txtarea.value).substring(selStart, selEnd)
	var s3 = (txtarea.value).substring(selEnd, selLength);
	txtarea.value = s1 + open + s2 + close + s3;
	return;
}
function storeCaret (textAr){
	selectedInputArea = textAr;
	if (textAr.createTextRange){
		selectedRange = document.selection.createRange().duplicate();
	}
}
function addText(text){
	if (window.selectedInputArea){
		var ta = selectedInputArea;
		val = text.split('][');
		if ((clientVer >= 4) && is_ie && is_win){
			theSelection = document.selection.createRange().text;
			if (theSelection) {
				document.selection.createRange().text = val[0] +']' +  theSelection + '[' + val[1];
				ta.focus();
				theSelection = '';
				return;
			}
		}else if (ta.selectionEnd && (ta.selectionEnd - ta.selectionStart > 0)){
			mozWrap(ta, val[0] +']', '[' + val[1]);
			return;
		}
		text = ' ' + text + ' ';
		if (ta.createTextRange && selectedRange) {
			var caretPos = selectedRange;
			caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? caretPos.text + text + ' ' : caretPos.text + text;
			ta.focus();
		} else {
			ta.value  += text;
			ta.focus();
		}
	}
}