[albiwan]

I wanna take some pictures in a Club here in Vegas but how do I achieve a nice effect? If i use the flash everything get bright except for the dark background. I actually wanna keep the color of the lights to keep the atmosphere but I'd like to capture the people in the right way...so they are not blurry or shaky. If i keep a long exposure than everything looks blurry but I have the colors I need. Do I have to set the flash as "rear". I have a nikon D50 and a SB600. Please help