Google API mod for PHP website

My site is written using phpfox (a CMS similar to drupal and Joomla) The site allows users to enter details of forthcoming 'events' ('date', 'time', 'event type' and 'location') I have installed a pre-written 'mod' that marks the location of the events on a GoogleMap I have a problem.......... The existing 'mod' shows markers on the map for EVERY event in the database (even if the event is in the past). So as more users add more events the map is getting 'full'. The website allows for users to select a geographical area, time or event type to 'filter' only certain events. I wish that ONLY these events that have been 'filtered' from the database to be shown on the map. I have a working site and a GoogleMaps API. The system works great at the moment apart from the fact that too many markers are placed on the map and I wish only to show markers for selected (filtered) events to be shown. When a user browses events, he can filter based on several criteria, and these 'filtered' events are shown OK on the website. But the markers on the map dont relate to the selected events. eg. I have 100 events in the database A user selects only to show events happening in the next 7 days The details of these events are shown on the website OK...but the map shows 100 markers that represent ALL 100 events in the database, not just the 'filtered' results. I think it is not a difficult task to update the code so that instead of marking ALL events on the map, only the filtered results are shown. A knowledge of Google API is essential A knowledge of PHP is essential A knowledge of phpfox would be useful Someone who has knowledge of all the above could probably do the mod in about 10 minutes!!