//find selection
var focusedWindow = new XPCNativeWrapper(document.commandDispatcher.focusedWindow, 'document', 'getSelection()');

var selection = focusedWindow.getSelection();
var name = selection.toString();
var start = selection.getRangeAt(0).startOffset;
var end = selection.getRangeAt(0).endOffset;
var container = selection.getRangeAt(0).startContainer;


//make "pebble"
var pebble = document.createElement("div");
var text = document.createTextNode("(*)");
pebble.appendChild(text);
var link = document.createElement("a");
link.setAttribute("name", "ff_extension_pebble_marker_link");
var image = document.createElement("img");
image.setAttribute("src", "chrome://pebbles/content/pebble.png");
pebble.appendChild(image);
pebble.appendChild(link);

//alert(container.parentNode.parentNode);
//alert(container.parentNode.previousSibling);

//insert somewhere before selection
container.parentNode.parentNode.insertBefore(pebble, container.parentNode.previousSibling);