// from http://www.javascriptit.net/code/insert-text-at-cursor-in-text-field/

function edit_insertAtCursor(myField, myValue) {
	//IE support
	if (document.selection) {
		myField.focus();
		sel = document.selection.createRange();
		sel.text = myValue;
	}
	//MOZILLA/NETSCAPE support
	else if (myField.selectionStart || myField.selectionStart == '0') {
		var startPos = myField.selectionStart;
		var endPos = myField.selectionEnd;
		myField.value = myField.value.substring(0, startPos)
			+ myValue
			+ myField.value.substring(endPos, myField.value.length);
	} else {
		myField.value += myValue;
	}
}

// calling the function

// edit_insertAtCursor(document.formName.fieldName, 'this value');



// from http://www.theblueform.com/Home/TheMakingOf.aspx

function edit_CaretPosition()
{
 var start = null;
 var end = null;
}

function edit_getCaretPosition(oField)
{
 // Initialise the CaretPosition object
 var oCaretPos = new edit_CaretPosition();

 // IE support
 if(document.selection)
 {
  // Focus on the text box
  oField.focus();

  // This returns us an object containing
  // information about the currently selected text
  var oSel = document.selection.createRange();

  // Find out the length of the selected text
  // (you'll see why below)
  var selectionLength = oSel.text.length;

  // Move the selection start to 0 position.
  //
  // This is where it gets interesting, and this is why
  // some have claimed you can't get the caret positions
  // in IE.
  //
  // IE has no 'selectionStart' or 'selectionEnd' property,
  // so we can not get or set this value directly. We can
  // only move the caret positions relative to where they
  // currently are (this should make more sense when you read
  // the next line of code).
  //
  // Note, that even though we have moved the start
  // position on our object in memory, this is not reflected
  // in the browser until we call oSel.select() (which we're
  // not going to do here).
  //
  // Also note, the start position will never be a negative
  // number, no matter how far we try to move it back.
  oSel.moveStart ('character', -oField.value.length);

  // This is where it should start to make sense. We now know
  // our start caret position is the length of the currently
  // selected text minus the original selection length
  // (think about it).
  oCaretPos.start = oSel.text.length - selectionLength;

  // Since the start of the selection is at the start of the
  // text, we know that the length of the selection is also
  // the index of the end caret position.
  oCaretPos.end = oSel.text.length;
 }
 // Firefox support
 else if(oField.selectionStart || oField.selectionStart == '0')
 {
  // This is a whole lot easier in Firefox
  oCaretPos.start = oField.selectionStart;
  oCaretPos.end = oField.selectionEnd;
 }

 // Return results
 return (oCaretPos);
}

function edit_setCaretPosition(oField, iCaretStart, iCaretEnd)
{
 // IE Support
 if (document.selection)
 {
  // Focus on the text box
  oField.focus();

  // This returns us an object containing
  // information about the currently selected text
  var oSel = document.selection.createRange();

  // Since we don't know where the caret positions
  // currently are (see comments in getCaretPosition() for
  // further information on this), move them to position 0.
  //
  // Note, the caret positions will never be a negative
  // number, no matter how far we try to move them back.
  oSel.moveStart ('character', -oField.value.length);
  oSel.moveEnd ('character', -oField.value.length);

  // Now we know the caret positions are at index 0, move
  // them forward to the desired position (move end caret
  // position first - actually not sure if moving start
  // caret position first affects the end caret position -
  // it might).
  //
  // Note, we allow for a null end caret position and just
  // default it to the same as the start caret position.
  if(iCaretEnd != null)
   oSel.moveEnd ('character', iCaretEnd);
  else
   oSel.moveEnd ('character', iCaretStart);

  oSel.moveStart ('character', iCaretStart);

  // Everything thus far has just been on our object in
  // memory - this line actually updates the browser
  oSel.select();
 }
 // Firefox support
 else if(oField.selectionStart || oField.selectionStart == '0')
 {
  oField.selectionStart = iCaretStart;

  if(iCaretEnd != null)
   oField.selectionEnd = iCaretEnd;
  else
   oField.selectionEnd = iCaretStart;

  oField.focus();
 }
}

function edit_simpleInsertMarkup(myField, markup) {

	var cp = new edit_CaretPosition();
	cp = edit_getCaretPosition(myField);

	edit_insertAtCursor(myField, markup);
	edit_setCaretPosition(myField, cp.start + markup.length, cp.end + markup.length);
	
}

function edit_insertMarkup(myField, markupStart, markupMiddle, markupEnd, prompt1, default1, prompt2, default2) {

	var arg1 = prompt(prompt1, default1);
	if ((arg1 != null) && (arg1 != '')) {
		var arg2 = (markupMiddle != '') ? prompt(prompt2, default2) : '';
		if ((markupMiddle == '') || ((arg2 != null) && (arg2 != ''))) {
			var output = markupStart + arg1;
			output = output + ((markupMiddle != '') ? markupMiddle + arg2 : '');
			output = output + markupEnd;

			edit_simpleInsertMarkup(myField, output);

		}
	}

}