Modify CSS/HTML and Javascript for an Existing Web Page Template

This project is for modifying the CSS/HTML and some Javascript for a web page template that we bought. I need someone who can make the below changes to this template: [login to view URL] We'll supply the template to the winning bidder. This is only modifying 5 pages! 1. The current product layout on these two page... [login to view URL] [login to view URL] ...display 3 products per row in an 1170px width. We want both pages to be modified to display the full width of the screen resolution (up to 5 on a 1920px wide monitor) being fully responsive and fitting however many product boxes will fit per row depending on the resolution of the monitor/device. 2. The same as #1, but we want a second version of both of those pages with smaller product boxes so that on a 1920px wide monitor, up to 7 product boxes will fit on a row. 3. When clicking the "magnifying glass" to search, a blue panel slides down. I want to change that panel to be an advanced search panel like the one found here: [login to view URL] The fields we will be filtering will of course be named different (I will provide those to the winning bidder), but they will still involve sliders, text boxes and checkboxes. It needs to be able to make Ajax requests to a server script that we already have that will return JSON so that your javascript can display the products as the filters are changed. In addition, your javascript needs to send a request to our server script when the "Load More" button is clicked at the bottom of the pages in #1 and #2 or the page is scrolled to the bottom. We do not need you to do any server side coding! We already have the server side script done and we can modify it as you need us to so that it can work with your Javascript. 4. We want an additional page that displays the product feed in a table style grid similar to the Blue Nile URL provided that functions with the same filters and load more/scrolling loading. All modifications above should be done in such a way that it doesn't cause the other pages to not work. Your modifications should work on Windows, Apple and Android computers and mobile devices and should display properly in all current and recent versions of Google Chrome, Internet Explorer, Firefox, and Safari.