putting an overlay over a div

I got a div with some text and a link tag in it, when i click on the link i would like to have an overlay over the div so the opacity is set to .3 or so开发者_如何学JAVAmething and have a little form put over it. Does anyone know how to approach this in jquery?

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You can use my elementOverlay plugin:

var overlay = $('#yourDiv').elementOverlay();

// some code

overlay.elementOverlay('hide');

Plugin code: https://github.com/jgauffin/griffin.jquery.tools/blob/master/Source/Plugins/jquery.griffin.elementoverlay.js

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Just make a div of a fixed size, width and position (the same and place as the original) and set It's background color to slightly transparent.