This has gotten so far,that I will sum up what we found out:
Inside the event handler the attribute src cannot be read in IE8 (FF works fine), neither with
And why don't you easily use one working?
alert(jQuery(this).children('#Image_center').attr('src'));
change children to find
alert(jQuery(this).find('#Image_center').attr('src'));
It is probably the easiest solution, and when it work, why wouldn't you use it?