[ADDISON]

Here is class .logo from the original skin

#header .line1 .logo {
  position: absolute;
  left: 20px;
  top: 31px;
  height: 50px;
  width: 228px;
  margin: 0;
  padding: 0;
}

#header .line1 .logo a:link,
#header .line1 .logo a:visited,
#header .line1 .logo a:hover,
#header .line1 .logo a:active
{
  display: block;
  width: 228px;
  height: 50px;
  background: transparent url(../images/fashion_mosaic/company_logo.gif) no-repeat left top;
}

#header .line1 .logo img {
  display: none;
}

(this one hides the xcart.gif)

Looking over your css, you did a lot of changes not ok. Try undo all your changes, you can replace with the original CSS file.

1) Upload the image file you modified in (../images/fashion_mosaic/company_logo.gif).

2) Change left: 20px; top: 31px; height: 50px; width: 228px; to the fist class in this post.

3) Change height and width to the class with anchors, the second class in this post.

Before editing the css file, steps 2 - 3 are OK to be done in Firebug (Firefox) or Dragonfly (Opera).