Need url syntax to access image from windows shared drive fr XL Macro addPicture mtd- MAC

Hi All,
I have a macro that uses Shapes.AddPicture(ImagePath,True,True,objCell.Left, ObjCell.Top, 60,60) to display images in the sxcel sheet. The images are stored in a shared windows drive ( In windows terms //bshared/images). I set this to ImagePath. Works fine for windows. But for Mac ( Excel Mac 2011) it does not work. Could anyone please tell me what how I should specify the image path to make it work for Mac OS?