Merge pull request #3 from Asakeron/master

Add support for dynamically loaded content
Merge pull request #6 from Asakeron/master

Automatically calculating the z-index
Removed fade effect for better mobile performance
Fix apply error on <IE9
Merge pull request #10 from philhaz/dev

Fix apply error on <IE9
Remove old overlays
Merge pull request #11 from ssbb/master

Remove old overlays
Fix variable usage before it defined
Merge pull request #12 from ssbb/master

Fix variable usage before it defined
Fix indentation
Add code to handle cases where zIndex returns -Infinity.