Imagemap e php

[gennahouse]

Ciao ragazzi, ho un problemone, ho creato un immagine una mappa eccla:

[img]/img/m/scheletro.JPG[/img]
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ecco io devo fare in modo che in base al tipo di terreno mi metta sopra allo scheletro dele caselle diverse...
ma come posso mettere sui rettangoli vuoti dello scheletro altre immagini?