hey friends i am new to webdesigning thsi is what i have made www.hydrolecinc.com
as u see my pages are very wide i need to fix then to 800*600 resolution
i use adobe dream weaver please help me do that i have some idea of css
but never used them

No, you don't need to use a fixed width layout. That is what you refer to, I think. The problem is that the page gets to wide when the window size/resolution isn't as large as what you probably used when you designed it. The cause of that is mainly the large graphics. This one alone causes a scrollbar on my screen even if I maximize the browser window.
http://www.hydrolecinc.com/Tutorials/all%20machine66.gif

So, I'd create smaller images to start with.

See if you get aany ideas from this.
http://htmlhelp.com/faq/html/design.html#screen-size