function chng(btn,menu,aktiv){
  if(menu == "main"){
    document.getElementById("button"+btn).style.backgroundColor="#ffffff";
    document.getElementById("button"+btn).style.color="#3366CC";
    if(aktiv != btn){
      document.getElementById("button"+btn).style.fontWeight = "normal";
    }
  }else{
    document.getElementById("sub"+btn).style.backgroundColor="#ffffff";
    document.getElementById("sub"+btn).style.color="#3366CC";
  }
}
function unchng(btn,menu,aktiv){
  if(menu == "main"){
    if(aktiv != btn){
    document.getElementById("button"+btn).style.backgroundColor="#3366CC";
    document.getElementById("button"+btn).style.color="#ffffff";
    }
  }else{
    document.getElementById("sub"+btn).style.backgroundColor="#3366CC";
    document.getElementById("sub"+btn).style.color="#ffffff";
  }
}