I've noticed that Shift+LeftCLick on a HyperLink opens the link in a new browser with a menu (under IE), but tries to save the linked page in Netscape. Is there a way to intercept this?

I've seen Javascript code that intercepts a mouse click, but I haven't seen code that "tests for modifiers" like Shift, Ctrl, Alt, F1...F12.

Any suggestions in any language for intercepting this in a web page?