Answer:
According to Honda's website the standard Civic models did not start using a timing chain until 2006 with the exception of the SI models which were a different engine and have always had a timing chain. But PRIOR to 2006 all the other civic models had timing belts (which have to be replaced to be replaced periodically).
2005 LX = http://www.hondapartsnow.com/Page_Product/PartDetail.aspx?catalogID=57&productID=4&yearID=36&doorID=1&gradeID=5&areaID=2&transmissionID=5&originID=-1&colorLabelIDs=-1&colorLabelID=-1§ionID=1&idAndImageID=10117%20463653&isBigPicture=False&pageName=Camshaft%20-%20Timing%20Belt
2002 SI = http://www.hondapartsnow.com/Page_Product/PartDetail.aspx?catalogID=58&productID=4&yearID=20&doorID=2&gradeID=11&areaID=2&transmissionID=3&originID=-1&colorLabelIDs=-1&colorLabelID=-1§ionID=1&idAndImageID=10249%20463732&isBigPicture=False&pageName=Camshaft%20-%20Cam%20Chain