[Plugin: SimpleMap Store Locator] Custom Tiles in Simplemap

Hi
I’m using simplemap v. 2.4.4 and i would like to overlay the googlemap with a custom made map. I made all the map tiles with maptiler and i have a script api v3 to create the map over a googlemap. I would like to import this script in simplemap.

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I tried to import it in classes/simplemap.php after line 737 but that does not work.
Where can i import ths script.
Can anybody help?

Thanks!

http://wordpress.org/extend/plugins/simplemap/