looks like this is available in the Google Maps v3 api:
reference.html
you can convert pro maps to using the v3 api by editing the following line:
<script type="text/javascript" src="http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAzdubZVAMycelfiiPTYpVFBQPFfY7zKGhKSBgg4Uk6CKe9Mc3hhSAtsG1lpEwuqfqQ_TTP-avu9iPMQ">/*wagmp*/</script>
</head>
change the v=2 to v=3:
<script type="text/javascript" src="http://maps.google.com/maps?file=api&v=3&key=ABQIAAAAzdubZVAMycelfiiPTYpVFBQPFfY7zKGhKSBgg4Uk6CKe9Mc3hhSAtsG1lpEwuqfqQ_TTP-avu9iPMQ">/*wagmp*/</script>
</head>
cant really say how easy it will be to implement, but with a good understanding of the google maps API, it should be doable, though we wont really be able to offer any assistance with it.