function smilie(thesmilie)
{
	getActiveText();
	var AddSmilie = " " + thesmilie + " ";
	AddText(AddSmilie);
}

function AddText(NewCode)
{
	if (typeof(theform.message.createTextRange) != "undefined" && theform.message.caretPos)
	{
		var caretPos = theform.message.caretPos;
		caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? NewCode + ' ' : NewCode;
		caretPos.select();
	}
	else if (theform.message.selectionStart || theform.message.selectionStart == '0')
	{ // its mozilla and we'll need to re-write entire text
		var start_selection = theform.message.selectionStart;
		var end_selection = theform.message.selectionEnd;

		// fetch everything from start of text area to selection start
		var start = (theform.message.value).substring(0, start_selection);
		// fetch everything from start of selection to end of selection
		var middle = NewCode;
		// fetch everything from end of selection to end of text area
		var end = (theform.message.value).substring(end_selection, theform.message.textLength);

		theform.message.value = start + middle + end;
		setfocus();
		theform.message.selectionStart = end_selection + middle.length;
		theform.message.selectionEnd = start_selection + middle.length;
		getActiveText();
		AddTxt = "";
		return;
	}
	else
	{
		theform.message.value += NewCode;
	}
	setfocus();
	getActiveText();
	AddTxt = "";
}

<a href="#" onclick="smilie(';)'); return false;"><img src="images/smilies/smilehz.gif" alt="Wink" border="0" /></a>