Free form Hot spot question curser behavior

Does anyone know how to maker the curser inactive on background images over which there are hot spots in a free form hot spot question? 

Using the free form hot spot tools I have created a series of hot spot questions using background images from the course content. Each image has 3 hotspots identified by numbers with rollovers, one is correct.

The multiple choice question explanation of the options also appears over the image. Problem is that the curser is active over the whole image not just the hot spots. If the user clicks say the explanation text or inadvertently elsewhere on the image they get an incorrect score and kicked of to the next question. 

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