Check if cursor is over a phone number

Hy everybody!

I try to build a SBO-AddOn that tells me if i'm on a Phone-Nr. Field.

SBO shows a small phone nerby the mousecursor, maybe it would be enough if i would know hot to check the Mousepointer, if it's the normal or the MousePointer with the small phone nerby...

Does anybody have other ideas?

How can i access the information on this "special Field Type". SBO seems to know this, otherwise it would'nt be able to show the small phone when the cursor is on a filled PhoneNr. Field. I tryed to find some infos in this Forum but i could'n find any Help's/HowTos... Maybe somebody knows a way to handle this !

Thank you very much !

Andreas