Polygon Creator and Polygon Calculator

Hello, sorry for my bad english... I need two scripts. The first scripts load the google maps api v3 with html5 geolocation and the user can create a polygon like the following example: [login to view URL] The user can the the area in ha (10.000 m²) all the time. He can change all the points of the polygon. I want to save the polygon by pushing a button via php in a mysql database. The second script loads several points of one polygon out of a php mysql database. The polygon will be displayes in google maps (centered) and the area in ha will be shown. The user can change the points and after pushing a button he saves the new points in an php mysql system. regards daniel feiter