I usually have my Gmails linked to Thunderbird but this should work great when am not my home machine!
From their official blog - Access two Gmail accounts at once in the same browser - Official Gmail Blog
From their official blog - Access two Gmail accounts at once in the same browser - Official Gmail Blog
Now, you can visit google.com/accounts and click the link next to "Multiple sign-in." After you sign into your first account, you can sign in with up to two additional accounts from the new accounts menu in the upper right hand corner of Gmail, then easily toggle back and forth between them. You can even open multiple Gmail tabs — one for each of your accounts.
Please keep in mind that this is a feature for advanced users, and there are a couple things to watch out for: