jQuery.scrollLeft() when direction is rtl - different values in different browsers

The scrollLeft property of a div seems to return different values in different browsers when the body direction is rtl.

An example can be seen here - http://jsfiddle.net/auVLZ/2/

body { direction: rtl; }
div.Container { border: 5px solid #F00; width: 500px; height: 400px; overflow: auto; }    
div.Content { background-color: #00F; width: 900px; height: 380px; }​

<div id="divContainer" class="Container">
    <div class="Content"></div>
</div>
<br />
<input id="showScrollLeft" type="button" value="Show ScrollLeft" />​

$(document).ready(function()
{
    $("#showScrollLeft").click(function(e)
    {
        alert($("div.Container").scrollLeft());
    });
});​

Chrome - the initial value is 400, and when moving the scrollbar to the left it is 0.

IE8 - 0 and 400.

Firefox - 0 and -400.

What is causing this difference and how can it be handled?

Edit: note that this is happening with the "regular" scrollLeft as well - document.getElementById("divContainer").scrollLeft returns the same results.