flow of content

I’m working with the Weaver II theme. I’m placing a contact form on a static page that appears left justified. I’m trying to include an image next to the form but WordPress will not permit this. Any error message resulting from an incorrect form entry is styled to appear on top of the field so there shouldn’t be space required on the right of the form to display error messages. I’ve tried inserting thumbnail images that would appear between the form and the right sidebar but WordPress continues to place the image below the form on the next line. Could anyone offer an explanation why this would happen. I’ve tried 2 different contact form plugins, both with the same results.