Photoshop/imadeready and dreamweaver questions...

hey ive to build a website for a project in college during the easter and ive started some of it but ive encountered a few problems.

Right ive an image i got off the net cut out all the selection i wanted in this case a footballer so now theres no background just the footballer. (its that chequered background)

Anyways this is what i wanted so when i save it and import it into dreamweaver for some reason a new white background is on the image which isnt what i want. All i want is the actual footballer no background at all. Is there anyway of stopping photoshop creating the white background when i save it??

2nd question is...I made a banner but i wanted to slice it so that in one area of the text is the only place you can click for the link. This works in image ready but when i import into dreamweaver again it looses the image slice? Anyway of doing this?

3rd question...Does anyone know where i can download a trial version of macromedia dreamweaver so it would last me the easter break? Ive downloaded one trial version but it doesnt seem to open??

Anyways any help would be great thanks!