jquery.absolutemiddle

JQuery Plug-in to position an absolutely positioned element vertically within its relative parent (only dependancy is JQuery)

Demo's available here: AbsoluteMiddle JQuery Plugin.

Example use(s):

$( document ).ready(function() {

    // Middle -30 pixels 
    $('.in-the-middle').absoluteMiddle({
        pixelmod: -30 
    });

});