Google Maps API - Not displaying

Hi all,

I am trying to implement a simple map to one of the pages on a site I am building but it currently only displays the grey background and the map isn’t showing up.

I have tested the API code on a test page and it displays so it must be a problem with the CSS and the div.

http://www.aaronluckie.com/lboro/map.html

Thank you very much in advance,

Aaron