I think you only need Sourcerer! for the scripts. The rest should be fine through your editor (if you paste it into the HTML view).
If not, you can also put that into the Sourcerer! tags.
But you do need to place the Sourcerer! tags to let Sourcerer! handle it. Also, it is safest to use the double bracket syntax for the html tags, to prevent your editor from stripping the stuff.
Anyway, that would result into this:
{source}
[[script src="templates/rt_replicant_j15/js/rokflow.js" type="text/javascript" cha
rset="utf-8"]]
[[/script]]
window.addEvent('load', function() {
new RokFlow('rokflow');
});
[[/script]]
[[div id="rokflow"]]
[[div id="loader"]][[/div]]
(... etc ...)
[[/div]]
{/source}