.icon-menu-set {
	background:url(images/setting_ico.png) no-repeat 0 center;
}
.icon-menu-url {
	background:url(images/interlib_header_ico.png) no-repeat 0 center;
}
.icon-menu-file {
	background:url(images/page_ico.png) no-repeat 0 center;
}
.icon-menu-folder {
	background:url(images/folder_ico.png) no-repeat 0 center;
}
.icon-exit{
	background:url('images/exit.png') no-repeat center center;
}