function formatText(el,tagstart,tagend) {
	if (el.setSelectionRange) {
		el.value = el.value.substring(0,el.selectionStart) + tagstart + el.value.substring(el.selectionStart,el.selectionEnd) + tagend + el.value.substring(el.selectionEnd,el.value.length)
	}
	else {
		var selectedText = document.selection.createRange().text;
		if (selectedText != "") {
			var newText = tagstart + selectedText + tagend;
			document.selection.createRange().text = newText;
		} 
	}
}