#toplevel_page_dzsprg_builder .wp-menu-image{
    background: transparent url(img/icon.png) center center no-repeat;
}#toplevel_page_dzsprg_builder:hover .wp-menu-image{
     background: transparent url(img/icon-hover.png) center center no-repeat;
 }
#toplevel_page_dzsprg_builder.wp-menu-open .wp-menu-image{
    background: transparent url(img/icon-hover.png) center center no-repeat;
}