Forum Moderators: open
If you haven't already, I invite you to read our Welcome Thread [webmasterworld.com]. You'll learn a lot about the tools this place offers and the Terms of Service rules for our members that keep everything running smoothly.
On to your questions.
A fixed background image (one that doesn't scroll) is created in stylesheets - using "background-attachment" which has two possible values, "scroll" and "fixed". So, a stlyesheet might include this rule:
body {
background-image: url(bg.gif)
background-attachment: fixed
}
But I'm not clear about your second question. Do you mean having a link change in appearance when you pass the cursor over it (that's handled with a:hover) or by "currently selected", do you mean the menu item for the page that is currently displayed?
With frames having an active link that reloads the same page is unavoidable. Are you talking about a framed page?