there is a handy dandy search tool at the bottom of the forum page !!! looks like this and works a treat
LASSO THE TOOL AROUND THE IMAGE WITH A FEATHER OF 20PX THEN ADD VECTOR MASK WHICH IS ON THE LAYERS PALLETE. THERE ARE SO MANY EASY WAYS, YOU CAN EVEN ERASE THE EDGES OF THE PICTURE BY JUST ADJUSTING THE OPACITY LEVEL.
I agree with Pernik more........ And why in the world are you attaching your sigs?!?! How about uploading them to a free image site..