History.go(-2)
<html> <head> <title>History</title> </head> <body> <h1>history object</h1> <a href="" onclick="history.back();return false">history.back()</a><br /> <a href="" onclick="history.go(-2);return false">history.go(-2)</a><br /><br /> <a href="" onclick="history.forward();return false">history.forward()</a><br /> </script> </body> </html>