.back{background:url('../images/back.png') no-repeat}
.pie{background:url('../images/pie.png') no-repeat}
.pictures{background:url('../images/pictures.png') no-repeat} 
.pencil{background:url('../images/pencil.png') no-repeat}
.map{background:url('../images/map.png') no-repeat}
.group_add{background:url('../images/group_add.png') no-repeat}
.calculator{background:url('../images/calculator.png') no-repeat}
.folder{background:url('../images/folder.png') no-repeat}
.ico_13{background:url('../images/ico_13.gif') no-repeat}
.icon_user{background:url('../images/icon_user.gif') no-repeat}
.ico_16{background:url('../images/ico_16.gif') no-repeat}
.ico_16{background:url('../images/ico_16.gif') no-repeat}
.ico_08{background:url('../images/ico_08.gif') no-repeat}
.ico_60{background:url('../images/ico_60.gif') no-repeat}
.ico_14{background:url('../images/ico_14.gif') no-repeat}
.key{background:url('../images/key.gif') no-repeat}
.ico_67{background:url('../images/ico_67.gif') no-repeat}
.1{background:url('../images/1.png') no-repeat}
.student{background:url('../images/student.png') no-repeat}
.pictures2{background:url('../images/pictures2.png') no-repeat}
.ico_map{background:url('../images/ico_map.png') no-repeat}