Need help with OS Commerce

Hello We are a small business that sells art [login to view URL] store was built using OSCommerce,but we need to have it customized for a more professional [login to view URL] are some of our problems: [login to view URL] main layout of storefront looks really unprofessional for an online art [login to view URL] are no boarders,or anything to make it look as professional like a good site like [login to view URL] or [login to view URL] Can this be done with OS commerce? [login to view URL] you click on a thumbmail iage,it opens second window.....but the image is not [login to view URL] have to click on "Click to enlarge"...and even this in itselft opens up a 3rd [login to view URL] this be changed so that the iimage is automatically enlarged,and opens within the same window? [login to view URL] to our web designer there is a limit of 20 items per page,so there are gaps in our store so therefore its easy for users that think that they have seen all our items,when infact there are more on the next [login to view URL] it true that there is a limit of 20 items per page? [login to view URL] the "Show all products" looks really [login to view URL] images are all different sizes,and look very [login to view URL] this "Show all products" be removed,or at least customized to look decent? 5.Finally...when these things are done..how will it be uploaded to our store?Do we reinstall OS Commerce with the new changes?How does it work?