code a CSS drop down menu

I have a site that has existing CSS used throughout. The site used to have a flash navigation bar. This has been replaced by a regular HTML navbar with CSS mouseovers. I now need to add drop down menus to this. I could do it, but I'm feeling lazy. Please no canned CCS auto generated menus. You must be able to actually code it, please don't waste either of our time if you can't actually code. please provide several examples of work you've done as well as a portfolio. Need this done ASAP, tonight if possible.