function prod_01() {location.href = "/products/list.asp?product_code=a001";}
function prod_02() {location.href = "/products/list.asp?product_code=a002";}
function prod_03() {location.href = "/products/list.asp?product_code=a003";}
function prod_04() {location.href = "/products/list.asp?product_code=a004";}