JavaScript
Article
By Sam Deering

jQuery Find Highest Z-Index on Page

By Sam Deering
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jQuery code snippet find the highest z-index of absolute divs. Useful for making a new element appear absolutely at the top of all html elements.

//include jQuery.js --  visit: http://jquery.com/
$(function(){
    var maxZ = Math.max.apply(null,$.map($('body > *'), function(e,n){
           if($(e).css('position')=='absolute')
                return parseInt($(e).css('z-index'))||1 ;
           })
    );
    alert(maxZ);
});

Source

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