Alright, may I know what software you are using.
If you use the one that I currently use— "Adobe DreamWeaver" it allows the user to use the design or code section (which you are doing).
I recommend getting that and you will be able to do what you want it to look like.
But here you go, this should do it.
http://www.w3schools.com/tags/att_img_align.asp