.tab {text-align:left; padding:2px; margin:5x; float:left; margin-left:3px; margin-top:3px}
*.grau {background-color:#CCCCCC}
*.li {width:120px}
*.re {width:338px}

a.display_button:link, a.display_button:visited, a.display_button:active {display: block;width: 40px;height: 20px;
background: transparent url(/fileadmin/user_upload/PDFs/pdf_80x40.jpg) no-repeat 0 0;}
a.display_button:hover {background: transparent url(/fileadmin/user_upload/PDFs/pdf_80x40_over.jpg) no-repeat 0 0;}