You can also dispatch a custom click event via most recent browsers and fire an onclick event in IE. This is a recent feature that allows tons of control over events.

var button = document.getElementById(test);

button.onclick = function()

{

    alert(event was dispatched on me);      

}

if(document.createEvent)

{

    var click = document.createEvent(MouseEvents);

    click.initMouseEvent(click, true, true, window,

    0, 0, 0, 0, 0, false, false, false, false, 0, null);

    button = document.getElementById(test);

    button.dispatchEvent(click);

    button.focus();

}else if(document.documentElement.fireEvent)

{

    button = document.getElementById(test);

    button.fireEvent(onclick);

    button.focus();

}

http://jsfiddle.net/ZWyp7/3/

Do note that you need to listen for the event before dispatching it.