Try using a table:
[table]
[tr]
[td][img height=100]http://i.imgur.com/guWdCPZ.png[/img][/td]
[td] [/td]
[td][img height=100]http://i.imgur.com/CGlyFVR.jpg[/img][/td]
[/tr]
[/table]
You'll have to cheat a little and insert a table in between the 2 images and use a bunch of spaces to separate them. I wasn't able to use alignment tags or anything like that, unless you find a way.