HEAD Section:

<script language="JavaScript">

var msg = "Welcome to House of Scripts!!!!";

var i = 1;
function BlinkStatus() {

if (i) {
window.status = msg;
i = 0;
} else {
window.status = " ";
i = 1;
}

setTimeout("BlinkStatus()", 300); //300 is your speed

}

BlinkStatus();

</script>