The text is already hardcoded into the image. We could use CSS3 transformation for the text. E.g.

.rotate {
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}

This should work with Firefox 3.5+, Safari 3.1+, Opera 10.5+, Chrome 4+, IE 7+.