I recently purchased an iMac G5 OS X. I have no previous experience with Macs so I'm a bit lost on certain things. When I try to copy a picture from a website, the menue box pops up and I select Save Image As. but it doesn't do anything. What am I doing wrong? and also how do I change my background image from the once already on my desktop? Sorry, if I posted this in the wrong forum ..... and thank you in advance to anyone that can help me.