div question/problem

i'm writing html with css, and i can't figure out why a specific div is taking up the entire width of its container div.

no matter what width and height i give it, it stays the same.  consequently ( i believe )  i can't get it to move anywhere on the page using margin-left:   or margin-top:    ....  it's driving me nuts.

the only thing in this div is an img that's no bigger than 245px by 233px

any suggestions?