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Stop bubbling of events in Javascript and DOM

Last Modified: 2013-11-19
To have more details on the context of my problem, see:

I now have the following Javascript function to stop bubbling of events in JavaScript:
function StopBubble(e)
    /* http://www.quirksmode.org/js/events_order.html */
    if (!e)
        e = window.event;

    e.cancelBubble = true; /* Microsoft */
    if (e.stopPropagation)
        e.stopPropagation(); /* W3C */

My problem is that I dynamically create image objects with DOM. These objects have an OnClick event which must also call StopBubble...

I do it like this:
var delItemImg = document.createElement("img");
delItemImg.src = '/manage/fr/grafx/delete.png';
delItemImg.width = 20;
delItemImg.height = 20;
delItemImg.border = 0;
delItemImg.alt = 'Supprimer';
delItemImg.title = 'Supprimer';
delItemImg.onmouseover = MouseoverClickableImage;
delItemImg.onclick =  function() {DeleteItemFact(noFacture, noItem, typeItem, descItem); StopBubble(event);};
delItemImg.className = 'right';

It works well in IE (thanks to window.event) but in firefox I get "event is not defined".

I almost had a solution here:

but I don't get it :(

Please help !
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