Image Positioning

I need to raise an Image in CSS to the forground, above everything elece. But I can't seem to figure it out...

#sidebar .bottom {

 height: 90px;

 background: url('images/bg_sidebarbottom.gif') no-repeat bottom right;

}

I tyred 'float: top;' and breifly tryed 'external.zOrder: - 2' but no such luck

Can anyone lend a helping hand?

#457083

z:index: 1

#457107

thank you; sir

sorry for such a 'google' question, but I couldnt find anything

#457108

it's z-index

#457111