...(http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html)
2) Internet connection.(your system should be connected to the internet when the script is running.)
How to use it?
1) Run the jar file.
2) Now copy & paste the url in the url textfield.(use ctrl+v to paste)
3) Select the site which you think that the webpage belongs from the drop down list.
4) Now click on the check Button. :P
5) Now after it shows you a popup that the site is safe or dangerous you can click on the clear button to use it again.
6) Click on help button to get a quick tutorial.