Dashboard > Design > Page Element > Add Gadget > Html/java script
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<script src="http://fwzynn.googlepages.com/rainbow.user.js" type="text/javascript">
/***********************************************
* Script edited by Ynn Ainul at http://fwzynn.blogspot.com/
* Please keep this notice intact
***********************************************/
</script>

Save, Dan Lihatlah Hasilnya! :)