a.o_nas {
  display: block;
  background: url(/ua/img/nas1.gif) no-repeat;
  margin: 89px 70px 25px 135px;
}
div.o_nas, a.o_nas:hover {margin: 89px 70px 25px 135px; background: url(/ua/img/nas2.gif) no-repeat;}
a.work {
  display: block;
  background: url(/ua/img/pracia1.gif) no-repeat;
  margin: 28px 95px 25px 80px;
}
div.work, a.work:hover {margin: 28px 95px 25px 80px; background: url(/ua/img/pracia2.gif) no-repeat;}
a.projects {
  display: block;
  background: url(/ua/img/proekt1.gif) no-repeat;
  margin: 27px 155px 25px 50px;
}
div.projects, a.projects:hover {margin: 27px 155px 25px 50px; background: url(/ua/img/proekt2.gif) no-repeat;}

a.partners {
  display: block;
  background: url(/ua/img/partn1.gif) no-repeat;
  margin: 27px 45px 0px 80px;
}
div.partners, a.partners:hover {margin: 27px 45px 0px 80px; background: url(/ua/img/partn2.gif) no-repeat;}