I have one problem in that page http://www.gnsegroup.com/esecurity_products_services.shtml The products boxes are not aligned from the top to each others. each box is lower than the one next to it by 1px. The borderware box is lower than the blue coat box by one pixel and the cybergurad box is lower than the borderware by one pixel.
mostafa, due to excessive use of <div class=clear> after every single product boxes, every blocks goes down 1px below the left box. In your case, you have 3 product boxes in every rows. So its best to put 3 consecutive <div class=bl> one after another and just after the last product block insert only one <div class=clear> or simply <br />. This will clear the first row and brings cursor down to next row.