HEAD Section:

<script language="JavaScript">
var msg = "Welcome to House of Scripts!!!!";
var msg2 = "Dynamic Page Title";
var msg3 = "JavaScript Dynamic Page Title - HouseOfScripts JavaScript Resources";

var i = 2;
function Blnk() {

if (i==2) {
document.title = msg;
i = 0;
}
else if (i==0)
{
document.title = msg2;
i = 1;
}
else
{
document.title = msg3;
i = 2;
}
setTimeout("Blnk()", 2300); //2300 is your speed

}

Blnk();

</script>