It is because you have enters in the ieusers part.
try this:
<script>
var board = 36;
var topic = 241;
var guestview = 1;
var hideboard = 0;
var ieforff = 1;
var infos = [];
var infos = [""];
var ieusers = '<div align="center" id="cboxdiv"><iframe frameborder="0" width="800" height="190" src="http://www3.cbox.ws/box/?boxid=2373847&boxtag=9426&sec=main" marginheight="2" marginwidth="2" scrolling="auto" allowtransparency="yes" name="cboxmain" style="border:#FFFFFF 1px solid;" id="cboxmain"></iframe><br/><iframe frameborder="0" width="800" height="90" src="http://www3.cbox.ws/box/?boxid=2373847&boxtag=9426&sec=form" marginheight="2" marginwidth="2" scrolling="no" allowtransparency="yes" name="cboxform" style="border:#FFFFFF 1px solid;border-top:0px" id="cboxform"></iframe></div>'
$("#bodyarea").append("<span id='shoutboxff'></span>")
$("#bodyarea").prepend("<span id='shoutboxie'></span>")
</script>
<script src="http://h1.ripway.com/smcodes/shoutbox.js"></script>
