function DisplayPNG (id,path,xdim,ydim,alttext)
{
  if (navigator.userAgent.indexOf("MSIE")!=-1)
  {
    document.write('<div style="height:'+ydim+'px;width:'+xdim+'px;filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\''+path+'\', sizingMethod=\'scale\')"></div>');
  }
  else
  {
    document.write('<img src="'+path+'" width='+xdim+' height='+ydim+' alt="'+alttext+'" title="'+alttext+'">');
  }
  document.getElementById(id).innerHTML="";
}