I really didn't know much of the difference but this helped clear it up for me. Hope it does for you too!!

From the looks of the dates we entered into these 'treaties' it appears these institutions are the beginning of the demise of our sovereignty....

http://www.imf.org/external/pubs/ft/exrp/differ/differ.htm

"If you have difficulty distinguishing the World Bank from the International Monetary Fund, you are not alone. Most people have only the vaguest idea of what these institutions do, and very few people indeed could, if pressed on the point, say why and how they differ. Even John Maynard Keynes, a founding father of the two institutions and considered by many the most brilliant economist of the twentieth century, admitted at the inaugural meeting of the International Monetary Fund that he was confused by the names: he thought the Fund should be called a bank, and the Bank should be called a fund. Confusion has reigned ever since."

"Despite these and other similarities, however, the Bank and the IMF remain distinct. The fundamental difference is this: the Bank is primarily a development institution; the IMF is a cooperative institution that seeks to maintain an orderly system of payments and receipts between nations. Each has a different purpose, a distinct structure, receives its funding from different sources, assists different categories of members, and strives to achieve distinct goals through methods peculiar to itself."

"The international community assigned to the IMF a different purpose. In establishing the IMF, the world community was reacting to the unresolved financial problems instrumental in initiating and protracting the Great Depression of the 1930s: sudden, unpredictable variations in the exchange values of national currencies and a widespread disinclination among governments to allow their national currency to be exchanged for foreign currency. Set up as a voluntary and cooperative institution, the IMF attracts to its membership nations that are prepared, in a spirit of enlightened self-interest, to relinquish some measure of national sovereignty by abjuring practices injurious to the economic well-being of their fellow member nations. The rules of the institution, contained in the IMF's Articles of Agreement signed by all members, constitute a code of conduct."