.file-extension {
    display: inline-block;
    vertical-align: middle;
    background-image: url(/Images/FileExtensionsSmall.gif);
    width: 18px;
    height: 20px;
    background-repeat: no-repeat;
    background-origin: content-box;
}
.pdf {background-position: 0 -100px}
.doc {background-position: 0 -200px}
.rtf {background-position: 0 -300px}
.txt {background-position: 0 -400px}
.xls {background-position: 0 -500px}
.zip {background-position: 0 -600px}
.jpg {background-position: 0 -700px}
.gif {background-position: 0 -800px}
.png {background-position: 0 -900px}
.ppt {background-position: 0 -1000px}
.html,
.htm {background-position: 0 -1100px}
.docx {background-position: 0 -1600px}
.xlsx {background-position: 0 -1700px}
.csv {background-position: 0 -1800px}
.rar {background-position: 0 -1900px}
.jpeg {background-position: 0 -2000px}
.pptx {background-position: 0 -2100px}
.pps {background-position: 0 -2200px}
.ppsx {background-position: 0 -2300px}
.mp3 {background-position: 0 -2400px}
.wav {background-position: 0 -2500px}
.wma {background-position: 0 -2600px}
.ogg {background-position: 0 -2700px}
.mp4 {background-position: 0 -2800px}
.avi {background-position: 0 -2900px}
.mpg {background-position: 0 -3000px}
.mpeg {background-position: 0 -3100px}
.mov {background-position: 0 -3200px}
.wmv {background-position: 0 -3300px}
.book {background-position: 0 -3400px}
.iba {background-position: 0 -3500px}
.epub {background-position: 0 -3600px}
.fb2 {background-position: 0 -3700px}
.sfb {background-position: 0 -3800px}
.mobi {background-position: 0 -3900px}