.filepng, .filePNG {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -136px 0px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.filedoc, .filedocx, .fileDOC, .fileDOCX {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -68px -35px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.filefjsw, .fileFJSW {
  background: url(http://mathslinks.net/css/20130310filesprite.png) 0px -35px no-repeat;
  display: inline-block;
  width: 32px;
  height: 33px;
}

.filefxd, .fileFXD {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -34px -35px no-repeat;
  display: inline-block;
  width: 32px;
  height: 33px;
}

.fileggb, .fileGGB {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -34px 0px no-repeat;
  display: inline-block;
  width: 32px;
  height: 33px;
}

.filegif, .fileGIF {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -68px -70px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.filejpg, .fileJPG {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -102px 0px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.filemov, .fileMOV {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -136px -34px no-repeat;
  display: inline-block;
  width: 32px;
  height: 31px;
}

.filenotebook, .fileNotebook, .fileNOTEBOOK {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -68px 0px no-repeat;
  display: inline-block;
  width: 32px;
  height: 33px;
}

.filepdf, .filePDF {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -102px -34px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.fileppt, .filepptx, .filePPT, .filePPTX {
  background: url(http://mathslinks.net/css/20130310filesprite.png) 0px -70px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.fileswf, .fileSWF {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -102px -70px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.filexls, .filexlsx, .fileXLSX, .fileXLS {
  background: url(http://mathslinks.net/css/20130310filesprite.png) -34px -70px no-repeat;
  display: inline-block;
  width: 32px;
  height: 32px;
}

.filezip, .fileZIP {
  background: url(http://mathslinks.net/css/20130310filesprite.png) 0px 0px no-repeat;
  display: inline-block;
  width: 32px;
  height: 33px;
}