#header p {
  background: url(../images/slogan_en.png) no-repeat;
  clip: rect(0, 439px, 86px, 0);
  clip: rect(0 439px 86px 0); /* Syntaxe reconnue par IE */
  padding: 86px 0;
  position: absolute;
  right: 0;
  width: 439px;
}