something really quick n dirty, but does what you want...
make a footer.js file on the server, and in it have one function.
function writeFooter(){
Response.Write("Copyright Frollard enterprises LLC 2009");
}
"include" the footer.js file in the header of the html files.
ans where your footer should be, call writeFooter()
now... whenever you need to change it, just change the text in the footer.js file on the server.