Overlay Div That Can Be Clicked Through

[sleche]

I was wondering if there is a way using css or javascript that allows for a semi-transparent div element to appear visually on top of all other elements, but hyperlinks and other interactive elements under it can still be clicked? Just a whimsical idea to give my website the ability to darken or lighten the look of the website.EDITI know that z-index moves objects from the background to the foreground but they also block interactive objects...