DOM-based XSS - via URL

I have a website that I am testing but I am pretty new to all of this security stuff and would appreciate some help!. I have a url similar to the following: http://testurl?nexturl=whatever The nexturl parameter determines what url should be displayed after something has happened. I'm trying to test for XSS vulnerabilities and have disabled URL filtering in my browser. I am trying to replace the whatever with something like and if I view the page source code I see "nextUrl=" in it. However, I do not see an alert when the "something has happened". Is there some better piece of javaScript I can put in to the URL to see if it is executed?
http://dlvr.it/S1w8Vr

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