Menu links to homepage load different homepages

I have 3 'home' links on my main page... see https://www.selfbuildplans.co.uk
The title, a top menu 'home' link and a footer 'home' link.
The top menu 'home' link does not load the images in the center of the page and has a different URL...
Any help as to why this is and why it doesn't load define_main_page.php and how to change it, would be appreciated?
Thanks.

Because one is going to:
http://www.selfbuildplans.co.uk/
-> this one has the div **homepageRight **with another div within it homepagePics

And the other is going to:
http://www.selfbuildplans.co.uk/index.php?main_page=index
-> this one has the div **homepageRight **with another div that's not labelled

So, find the defined page that **has **the div homepagePics and change the possibly static link to a dynamic one :)

Thanks Twitchtoo..
However I'm not too sure what you mean.
The only define page that has the homepagepic links is the define_main_page.php file.
Please could you explain a little further what I need to do?
Thanks.

Please answer the questions listed above the "reply" area. Answering the questions in the "posting tips" will be useful. For example what version of Zen Cart are you using? What template? (there are more, please answer as many as you can).

Some additional information which would be useful: Why is there a login form not using SSL? Why are no canonical links present? What files are in the website root folder?