Intellij 12.0 ultimate doesn't work debugger in javascript

I'm trying to debug a javascript code in index.html file.
so I installed a plugin LiveEdit of intellij IDE and jetbrains IDE support extention of chrome.
and then move to intellij IDE screen, I clicked mouse right button on  index.html of project view(or window?), selected a [Debug "index.html"]  menu item.
after doing this, occured following issues.
=> Intellij debug window of scripts tab shows a comment "Not connected to Chrome".
=> In chrome browser, being executed automatically and shows a weird address in its address bar.
=> its screen shows white screen.
=> javascipt's break point doesn't break.


Who's know how to set a javascript debugger?