Picture thumnails for oscommerce

TASK 1: On our site [login to view URL] the thumnails are generated in the same KB size as the full picture size. This results that the loading time of pages that shows 30 product thumnails or more take too long time. The quality of the thumnails are also very bad. In some browsers suchs as opera or google chrome the thumbnails quality is good, but in IE and firefox the quality is very bad. We want a programmer that can install thumnails contribution on our site so that the KB size of the thumbnails are small AND the quality of the thumnails also has to be very high quality. TASK: 2 We also want the programmer to add some sorting options on the product listing page. So the customer can choose: 1. How many products they want to list on each page. (exmaple: Show 20 products per page, show 50 products per page or show all products in this category on one page) 2. sort products by; name, date-added and price.