How to change cursor with ctrl and shift?

[Sakari Ruoho]

Hello folks,

Was wondering how to change the mouse cursor behavior, when user  
presses either ctrl or shift key? Like in photoshop with select tool  
where u can add to selection by pressing shift and remove from  
selection by pressing ctrl? If anyone has implemented anything like  
this, any help would be appreaciated. Thank you!

Sakari Ruoho
Software Designer
sakari.ruoho at academica.com