Setup A Web Site For Art Gallery

I am trying to set up a web site for an art gallery.That is for new talents so I have no budget.I am not a web designer and I am facing some barriers.My problem is, I guess, about going around with the DOM node tree. My page looks like this:[code]How it works:In first place, after page has been loaded,I am using frame 4 to run a HTML form. After submit,iframe 3.1 is populated with thumbnails according to the query.When a thumbnail is clicked,I succeeded in bringing the corresponding text, talking about the artwork, on iframe 5.1 to do so, I change the html source in iframe 5.1.I am using for that: [code] The idea was about doing the same with the frame 4 that is for a larger picture of the artwork.But first I need to get rid of the form once it was submitted (bring a new HTML with a dummy transparent gif to be swapped with the desired picture).But how can I bring a new html in frame 4? After the form is submitted the 'action' moves to iframe 3.1.I tried changing the html source using getElementById but I could not find a way to get to the right object.Two src attibutes must be changed with code written in iframe 3.1. (where the thumbnails are clicked). But How can I address and change the HTML src code in FRAME 4 ? How can I address and change the src image in the new code loaded in FRAME 4 ?I have both attributes in variables but don't know how to get to the target elements