You can set timeout as your wish.
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<html>
<script language="JavaScript" type="text/javascript">
<!–
var text = 0;
var message=new Array();
message[0] = "Welcome to Rana's Blog Code Project!"
message[1] = "Get free source code from Rana's Blog."
message[2] = "Solution will be provided on request."
message[3] = "Good bye from Rana's blog code project."
function changeText() {
if (message.length > 0) {
document.change.descript.value=message[text];
text++; }............ http://blog.joggee.com/?p=59