Hmm it shouldn't matter how many tooltips you have defined. Looking at your .js file, the only issue I can see at a glance is the trailing comma you have at the end of each of the lines below, which may fumble IE browsers:
Code:
tooltips[0]=["images/sold.jpg", "<h2>Property Sold</h2>", {background:"#E6E8FA", color:"black", border:"1px solid #d3d3d3",}]
You might try doing a search and replace to quickly remove them all, such as replacing all instances of ",}] with }]. Other than that issue, I don't see anything else (not to say there necessarily isn't any).
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