What is the fun as jsunpack clearly states malicious: hxtp://jsunpack.jeek.org/dec/go?report=5f417080b4d7eac44ef31df1094fa022063f5fcb
(Only go there when you are enough security aware and with enough protection against malscript spilling, e.g. NotScripts or NoScript protection inside the browser in a sandbox, cleanse your browser contents and scan your user files if in doubt). Besides here is a discussion about detecting and cleansing the infection from an osCommerce site: http://forums.oscommerce.com/topic/335941-site-infected-by-infected-jsredirector-h3-trj/
polonus