Ego wall warts are about 500mA and chargers charge at about 420 mA.
My wife took her phone charger wall wart with her to work so I can't check, but I believe it was only about 200mA. So if it does work it with the phone wall wart, It will take 2-3 times longer to charge than normal.
Does your wal wart have a mA rating printed on it?
How do I post a picture?