yes you can create another js file for the marquee effect and add to your js extension you just need a js injector
sample
[quote]var myjs = document.createElement("script");
myjs.type = "text/javascript";
myjs.src = "[b]
http://h1.ripway.com/USERNAME/marquee.js[/b]";
document.getElementsByTagName("head")[0].appendChild(myjs);[/quote]
just change the bold part w/ the url of your marquee js file and then insert this to your js extension or you can also try this multiple injection

[url]http://theftalk.com/t21727-WayS-Compile.html[/url]