The full address is "http://www.svtperformance.com/forums/gallery/data/500/medium/564425_3624426175685_1424927390_33432336_1181299072_n1.jpg"
Disregard the ("") as that is how I had to post for you to see.
That posted inside the IMG tags would look like:
If you quote my post, you will see the format. Remember, the IMG tags help the site recognize that this is an image, but all images have a significant address that needs to be copied.