~ I FIND THE CODEE !
Thanks for ur help

And sorry if I not explained well ...

( I'm not good at english )
This is the code :
<SCRIPT LANGUAGE="JavaScript">
var count = 0;
//EN LA SIGUIENTE LINEA, AJUSTAR LA VELOCIDAD:
var delay = 200;
//EN LA SIGUIENTE LINEA, COLOCAR MENSAJE:
var text = " Say something here ";
function title_scroll () {
document.title = text.substring (count, text.length) + text.substring (0, count)
if (count < text.length)
count ++;
else
count = 0;
setTimeout ("title_scroll()", delay);
}
title_scroll();
</SCRIPT>