Javascript swirl animacion

Esta sencilla rutina permite ver un efecto muy bonito al cargar la página. Hace aparecer una imagen girando desde arriba.

<HTML>
<HEAD>
<TITLE> Swirl Animación </TITLE><STYLE TITLE="Animation" TYPE="text/css">
<!--
  #HD003255E3 { position: relative; left:10000; top:10000; }
-->
</STYLE>
<SCRIPT LANGUAGE="JavaScript1.2">
<!--
  // Scripting added by Sausage Software's HotDog 4
  if (navigator.appName == "Netscape") {
	refDoc = "document.";
	refStyle = "";
	refLeft = ".left";
	refTop = ".top";
  }
  else {
	refDoc = "document.all.";
	refStyle = ".style";
	refLeft = ".posLeft";
	refTop = ".posTop";
  }
  function ssg(s,k) {
    var sl=s.length>>1;
    var kl=k.length;
    var tmp;
    for(ss='',i=0; i<sl; i++) {
      tmp=i<<1;
      ss+=String.fromCharCode(eval("0x"+s.charAt(tmp)+s.charAt(tmp+1))^k.charCodeAt(i%kl));
    }
    return ss;
  }
  window.status="Please wait, generating DHTML animation code...";
  document.write('<SCRIPT LANGUAGE="JavaScript1.2">');
  document.write(ssg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otDog4"));
  document.write('</SCRIPT>');
//-->
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
<!--
  function initAnimation() {
    // Only run DHTML animation if newer browser is being used.
    if (navigator.appVersion.indexOf('4') != -1){
      
      swirlRight("HD003255E3");
      
    }
  }
//-->
</SCRIPT>
</HEAD>
<BODY onLoad="initAnimation()">
<SPAN ID="HD003255E3"><IMG SRC="ejemplos/bisco.gif" BORDER="0"></SPAN>
</BODY>
</HTML>
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