var string_to_show = document.getElementById("line").innerHTML;
var separator = " *** ";
var str = string_to_show + separator;
var strlen = str.length;
var start_pos = 0;
var time_out = 200;
var timerRef = null;

function show_string()
{
   document.getElementById("line").innerHTML = str.substring(start_pos, strlen) + 
                                         str.substring(0, start_pos);
   start_pos++;
   if( start_pos == strlen ) start_pos = 0;
}
show_string();
timerRef = setInterval("show_string()", time_out);