Site works fine in Internet Explorer but not on...

My site seems to work fine on Internet Explorer but on Netscape and Firefox it seems to be pushed to the right. This is a pain but workable.
The problem I've got is some of our customers are using MAC's and they've said that when they load the main page there is a horizontal scroll bar and they need to scroll across quite a way to get all the info. They are using Safari?

I was wondering what the problem might be. I've looked in the stylesheet and I've changed the width to 760px and removed the auto tab which plonks the site in the middle but it doesn't seem to make any difference.

Most of my potential customers will be using Windows and IE but I'd like to cater for those that aren't.

The site is https://www.dwarfsoftware.co.uk

If anyone can help I'd appreciate it!

Thanks

All I can say is use the search above and the terms stylesheet original and stylesheet new. This has been covered for months and your site is using both. While one can edit between them both, converting to a one stylesheet template is favored. You might also look at ZenCart 1.3.5 upgrading.

I've editted the stylesheet but not the stylesheet.new should I change this one aswell?

Yes, you need to edit both.

The thing with using two stylesheets is that they will interfer with each other.

You should really be using only one stylesheet which makes editing and updating a lot easier.

As Kobra mentioned, upgrading to 1.3.5 is recommended.