Look at this, hope will help you: http://wordpress.org/plugins/iframe/
I think that with this plugin, you won't have any problems. Just try it till is all done. And I am asking do they have simple HTML codes, such as:
Код:<a href=""><img src=""></a>
...something like this.
Nope, the codes starts with <iframe src=""> , beside i know at least for <a href="">