if ( navigator.appName == "Netscape" )
   var bNetscape = true;
else
   var bNetscape = false;

function displace (who)
{
   if (!who.isDisplaced)
   {
      who.isDisplaced = true;
      if (bNetscape) 
      {
         who.top += 1;
         who.left += 1;
      }
      else
      {
         who.style.top = parseInt(who.style.top) + 1;
         who.style.left = parseInt(who.style.left) + 1;
      }
   }
}

function displaceBack (who)
{
   if (who.isDisplaced)
   {
      who.isDisplaced = false;
      if (bNetscape) 
      {
         who.top -= 1;
         who.left -= 1;
      }
      else
      {
         who.style.top = parseInt(who.style.top) - 1;
         who.style.left = parseInt(who.style.left) - 1;
      }
   }
}