// http://www.alexking.org - LGPL
function insertAtCursor(myField, prefix, postfix) {
	var re = new RegExp("^(.*\\S)(\\s*)$");
  myField.focus();
  //IE support
  if (document.selection) {
    sel = document.selection.createRange();
		var selection = sel.text;
		var wasEmpty = (selection == "");
		var space = "";
		if (!wasEmpty) {
			var matches = selection.match(re);
			if (matches) {
				selection = RegExp.$1;
				space = RegExp.$2;
			}
		}
    sel.text = prefix+selection+postfix+space;
		sel.collapse(false);
		if (wasEmpty) {
			sel.moveEnd('character',-(prefix.length+1))
		}
		sel.select();
  }
  //MOZILLA/NETSCAPE support
  else {
		if (myField.selectionStart || myField.selectionStart == '0') {
			var startPos = myField.selectionStart;
			var endPos = myField.selectionEnd;
			var selection = myField.value.substring(startPos, endPos);
			var wasEmpty = (startPos == endPos);
			var space = "";
			if (!wasEmpty) {
				var matches = selection.match(re);
				if (matches) {
					selection = RegExp.$1;
					space = RegExp.$2;
				}
			}
			myField.value = myField.value.substring(0, startPos)
										+ prefix+selection+postfix+space
										+ myField.value.substring(endPos, myField.value.length);

			var newPosition;
			if (wasEmpty) {
				newPosition = startPos+prefix.length;
			} else {
				newPosition = startPos+prefix.length+selection.length+postfix.length+space.length;
			}
			myField.setSelectionRange(newPosition, newPosition);
		} else {
			myField.value += prefix+postfix;
			myField.setSelectionRange(startPos+prefix.length, startPos+prefix.length);
		}
	}
}