a[href $='.pdf'] {
   padding-right: 18px;
   background: transparent url("icons/icon_acrobat.gif") no-repeat center right;
}

a[href ^="mailto:"] {
   padding-right: 18px;
   background: transparent url("icons/icon_mailto.gif") no-repeat center right;
}

a[href $='.html'] {
   padding-right: 18px;
   background: transparent url("icons/icon_external.gif") no-repeat center right;
}

a[href $='.zip'] {
   padding-right: 18px;
   background: transparent url("icons/icon_zip.gif") no-repeat center right;
}

a[href $='.gb'] {
   padding-right: 18px;
   background: transparent url("icons/icon_text.gif") no-repeat center right;
}

a[href $='.txt'] {
   padding-right: 18px;
   background: transparent url("icons/icon_text.gif") no-repeat center right;
}

a[href $='.prl'] {
   padding-right: 18px;
   background: transparent url("icons/icon_perl.png") no-repeat center right;
}

a[href $='.sh'] {
   padding-right: 18px;
   background: transparent url("icons/icon_shell.png") no-repeat center right;
}

a[href $='.xls'] {
   padding-right: 18px;
   background: transparent url("icons/icon_excel.gif") no-repeat center right;
}

a[href $='.nex'] {
   padding-right: 18px;
   background: transparent url("icons/icon_paup.gif") no-repeat center right;
}

a[href $='.jpg'] {
   padding-right: 18px;
   background: transparent url("icons/icon_image.gif") no-repeat center right;
}