jquery script that shows content depending on screen resolution

Quite a simple thing really - need a jquery/javascript file writing for doing screen resolution detection and allows me to hide/show divs/id if the browser window over a certain size. For instance 1024 (width) would show normal content but anything over that (say 1440 native mac window size - mainly) we would allow to show more content. Really want a professional class building because i want to also calculate on page load how big screen rez is so i can decide how many bits of media to display. Can give you examples of what i mean. Should be fairly straight forward for a jquery javascript wizard.