stcnt =0;
msg = "Bienvenido a TOYPAC ......";
blnk = "                          ";
str = blnk + blnk + blnk + msg;

function scroller()
{
     window.status = str.substring(stcnt++,str.length+1);
     if (stcnt>str.length) stcnt=0;
     setTimeout("scroller()",150);
}

f = scroller();