function show(element){
  element.className += " hover";
}
function hide(element){
  element.className = element.className = "menu-mainhome_1";
}
function hidefirst(element){
  element.className = element.className = "menu-mainhome_1 first";
}
function hidelast(element){
  element.className = element.className = "menu-mainhome_1 last";
}