Hi
Finally i got solution form this link
http://www.tutorialspoint.com/javascript/javascript_page_redirect.htm[
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just i add setTimeout call redirect to other page after calling webservice method,so it have some time to tigger
function RedirectToLogin() {
var UserName = document.getElementById("MasterUser").value;
SuperFastWS.FnLogout(decodeURI(UserName));
setTimeout('Redirect()', 5);
}
function Redirect() {
window.location = "logout.aspx";
}
So above setTimeout i will get some 5 micro milli secs to wait and call redirect to other page.