<html> <head> <script type="text/javascript"> var djConfig = { baseScriptUri : "js/dojo/", parseOnLoad : true }; </script> <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script> <script> function f(){ alert(dojo.lastIndexOf(["foo", "hoo", "zoo", "shoe", "zoo", "nuu"], "zoo")); } </script> </head> <body onload=f()> </body> </html>