How should I quit my job?

I worked for a lab for almost a year before I had to have knee surgery. They laid me off because I needed to be off for six weeks. I ended up working for them again through a temp agency, I said I wouldn't work for them again because I hated it but I really don't like being without a job. I am going to start work somewhere else on Tuesday, I know it's not enough notice but I've never gotten any help from them with anything. I just feel really bad quitting and I don't want everyone pissy with me for my last few days. Any suggestions?