.pdf_ico_docu
        {
            margin-right:2px;
            background: url(../images/TreeIcon/pdf.png) no-repeat scroll 0 0 transparent;
            vertical-align:top; 
            *vertical-align:middle;
         }
      
        .word_ico_docu
        {
            margin-right:2px; 
            background: url(../images/TreeIcon/word.png) no-repeat scroll 0 0 transparent; 
            vertical-align:top;
            *vertical-align:middle ;
        }

        .picture_ico_docu
        {
            margin-right:2px; 
            background: url(../images/TreeIcon/jpg.png) no-repeat scroll 0 0 transparent; 
            vertical-align:top; 
            *vertical-align:middle;
        }

      .video_ico_docu
        {
            margin-right:2px;
            background: url(../images/TreeIcon/extension_flv.png) no-repeat scroll 0 0 transparent;
            vertical-align:top; 
            *vertical-align:middle;
        }

        .xls_ico_docu
        {
            margin-right:2px;
            background: url(../images/TreeIcon/excel.png) no-repeat scroll 0 0 transparent;
            vertical-align:top; 
            *vertical-align:middle
        }

        .ppt_ico_docu
        {
            margin-right:2px;
            background: url(../images/TreeIcon/ppt.png) no-repeat scroll 0 0 transparent;
            vertical-align:top;
            *vertical-align:middle;
        }

        .other_ico_docu
        {
            margin-right:2px; 
            background: url("../images/TreeIcon/doc.png") no-repeat scroll 0 0 transparent;
            vertical-align:top;
            *vertical-align:middle;
        }