1) I have a site, using jQuery and the gMap Google Maps plugin. This all works perfectly, and I get my markers set right, and I really like this solution. This is how it looks l
It is only a small thing in Loader.php:
echo "[".$markers.$MyNewPositionMarker."]";
//and removed the [] at the position when loading the new map: WRONG... markers: [data], ... RIGHT: ... markers: data, ...
(This is just a copy-paste of the solution in the comment to remove the question from the "unanswered" list.)