Have you looked at this Thread. There is a link to a web site. Looks like he had to load the graphics as transparent features so he can control the mouseover event. Maybe this can help:http://forums.arcgis.com/threads/77010-Cursor-Hover-Style-Over-DynamicMapService
<style> circle { pointer-events: none; } path{ pointer-events: none; } </style>
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