optimising for the web

Right, i'm teaching myself photoshop and imageready so i'm doing the slicing and optimising in the latter. Problem is, when i check it out in a web viewer i get a surprisingly poor result - blocky, with those nasty halos around details...ya get the idea. So where am i going wrong? :confused:

When you optimize a file in Photoshop, you can select the level of quality you want... you probably saved it as poor or medium quality.

Hope that helped.

cheers, so should i go for high quality and compress from there - i was worried that doing this would give me a huge file size.

You can set it to either high or maximum... I usually save them as maximum... wich is 80% quality and it doesn't make huge files at all