function BGMenuOn(bgid,imgnr)
{
  document.getElementById(bgid).style.backgroundImage='url(./Images/Misc/front_bogyoro_on_'+imgnr+'.gif)';
}

function BGMenuOut(bgid,imgnr)
{
  document.getElementById(bgid).style.backgroundImage='url(./Images/Misc/front_bogyoro_'+imgnr+'.gif)';
}

function SwapImg(imgID,imgURL)
{
  document.getElementById(imgID).src = imgURL;
}