Enable Multi Sign-In feature in your google's Gmail account.

The Google provides the greats multi signin facility, here you can access more than one gmail account together and also switch together into all account.
You can Sign-In with multiple user in a same browser simultaneously.
so when you go to the Google Account Page you will see a "Multiple sign-in" lebel option like this.

now click on the change link. the google provide a message like this.

Now click on the On option and save the setting.

When you enable this feature, the most significant change is that you will see a new drop-down next to your email address at the top of the page in Gmail account and other supported Google products. Click on the drop-down and you can sign in to a new Google Account without signing out from the previous account.
"This is option is show when u are login with in atleast two of the gmail accounts."

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