.icons{
display:block;
width:50px!important;
height:50px;
}

.ai{background:transparent url(../images/icon/ai.jpg) no-repeat center center!important}
.pdf{background:transparent url(../images/icon/pdf.jpg) no-repeat center center!important}
.psd{background:transparent url(../images/icon/psd.jpg) no-repeat center center!important}
.swf,.fla,.fl{background:transparent url(../images/icon/swf.jpg) no-repeat center center!important}
.php{background:transparent url(../images/icon/php.jpg) no-repeat center center!important}
.html,.htm{background:transparent url(../images/icon/html.jpg) no-repeat center center!important}
.mp3{background:transparent url(../images/icon/mp3.jpg) no-repeat center center!important}
.zip{background:transparent url(../images/icon/zip.jpg) no-repeat center center!important}
.cdr{background:transparent url(../images/icon/cdr.jpg) no-repeat center center!important}
.js{background:transparent url(../images/icon/js.jpg) no-repeat center center!important}
.txt{background:transparent url(../images/icon/txt.jpg) no-repeat center center!important}
.rtf{background:transparent url(../images/icon/rtf.jpg) no-repeat center center!important}
.jpg{background:transparent url(../images/icon/jpg.jpg) no-repeat center center!important}
.jpg,.jpeg{background:transparent url(../images/icon/jpg.jpg) no-repeat center center!important}
.gif{background:transparent url(../images/icon/gif.jpg) no-repeat center center!important}
.xls{background:transparent url(../images/icon/xls.jpg) no-repeat center center!important}
.doc, .docx{background:transparent url(../images/icon/doc.jpg) no-repeat center center!important}
.ppt{background:transparent url(../images/icon/ppt.jpg) no-repeat center center!important}