function insertTags(openTag, closeTag, text) {
	var txtarea;
	if (document.editform) {
		txtarea = document.form.post;
	} else {
		var areas = document.getElementsByTagName('textarea');
		txtarea = areas[0];
	}
	var selText, isSample = false;

	if (document.selection  && document.selection.createRange) { // IE/Opera

		//save window scroll position
		if (document.documentElement && document.documentElement.scrollTop)
			var winScroll = document.documentElement.scrollTop
		else if (document.body)
			var winScroll = document.body.scrollTop;
		//get current selection  
		txtarea.focus();
		var range = document.selection.createRange();
		selText = range.text;
		//insert tags
		checkSelectedText();
		range.text = openTag + selText + closeTag;
		//mark sample text as selected
		if (isSample && range.moveStart) {
			if (window.opera)
				closeTag = closeTag.replace(/\n/g,'');
			range.moveStart('character', - closeTag.length - selText.length); 
			range.moveEnd('character', - closeTag.length); 
		}
		range.select();   
		//restore window scroll position
		if (document.documentElement && document.documentElement.scrollTop)
			document.documentElement.scrollTop = winScroll
		else if (document.body)
			document.body.scrollTop = winScroll;

	} else if (txtarea.selectionStart || txtarea.selectionStart == '0') { // Mozilla

		//save textarea scroll position
		var textScroll = txtarea.scrollTop;
		//get current selection
		txtarea.focus();
		var startPos = txtarea.selectionStart;
		var endPos = txtarea.selectionEnd;
		selText = txtarea.value.substring(startPos, endPos);
		//insert tags
		checkSelectedText();
		txtarea.value = txtarea.value.substring(0, startPos)
			+ openTag + selText + closeTag
			+ txtarea.value.substring(endPos, txtarea.value.length);
		//set new selection
		if (isSample) {
			txtarea.selectionStart = startPos + openTag.length;
			txtarea.selectionEnd = startPos + openTag.length + selText.length;
		} else {
			txtarea.selectionStart = startPos + openTag.length + selText.length + closeTag.length;
			txtarea.selectionEnd = txtarea.selectionStart;
		}
		//restore textarea scroll position
		txtarea.scrollTop = textScroll;
	} 

	function checkSelectedText(){
		if (!selText) {
			selText = text;
			isSample = true;
		} else if (selText.charAt(selText.length - 1) == ' ') { //exclude ending space char
			selText = selText.substring(0, selText.length - 1);
			closeTag += ' '
		} 
	}
}