If you are working with web colors a lot in Photoshop you should be using the web palettes. Photoshop comes with a couple and you can get various freeware palettes. One i recomend is made by www.visibone.com Photoshop Websafe palette



The Visibone Palette



Loading color palettes is easy just click the little arrow button on your swatch pallet
.


This should put you on your way to working with color effectivly with photoshop.