function validBw()
{
  var bw_ver = navigator.appVersion ? navigator.appVersion : 0;
  var bw_agent = navigator.userAgent ? navigator.userAgent : 0;
  var bw_DOM = document.getElementById ? 1 : 0;
  var bw_mac = (bw_ver.indexOf("Mac")>-1) ? 1 : 0;
  return ( (bw_ver.indexOf("MSIE")>-1 && bw_DOM && bw_agent.indexOf("Opera")==-1) || (document.layers && !bw_DOM) ) ? true : false;
}

// Preload

var preloadFlag = false;
var imgPreload = new Array(0);

function preloadImages()
{
  if (document.images)
    {
      for (var i=0; i<imgPreload.length; ++i)
        {
          images[i] = new Image();
          images[i].src = imgPreload[i];
        }
    }
  preloadFlag = true;
}

function changeImages()
{
  if (document.images && (preloadFlag == true)) 
    {
      for (var i=0; i<changeImages.arguments.length; i+=2)
	{
	  document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
	}
    }
}