I looked at your site in FF and Chrome and it looked OK except that your form text inputs don't stay within the bounds of the left sidebar, covering the 'R' in 'Red Orange'.
The site has loads of HTML validation errors: 48 errors according to the w3c validator. I don't know whether or not that's something you've done or if it's a part of your theme, but it needs to be sorted out or different browsers are all going to interpret your HTML differently.
You also have these error messages at the bottom of your page:
Warning: preg_match() [function.preg-match]: Compilation failed: nothing to repeat at offset 1 in /home/redorang/public_html/lifem.org.uk/wp-content/plugins/wassup/wassup.php on line 3954
Warning: preg_match() [function.preg-match]: Compilation failed: nothing to repeat at offset 1 in /home/redorang/public_html/lifem.org.uk/wp-content/plugins/wassup/wassup.php on line 3954
Sorry this is not very helpful, but I think you need to sort out the PHP errors and the HTML errors before you'll really know where you stand.
Cheers
PAE