function reset_tabs() {
  $('tab-home').className = "";
  $('tab-services').className = "";
  $('tab-solutions').className = "";
  $('tab-company').className = "";
}

function set_home_current() {
  reset_tabs();
  $('tab-home').className = "current";
}

function set_services_current() {
  reset_tabs();
  $('tab-services').className = "current";
}

function set_solutions_current() {
  reset_tabs();
  $('tab-solutions').className = "current";
}

function set_company_current() {
  reset_tabs();
  $('tab-company').className = "current";
}