function Login(){
var done=0;
var username=document.login.username.value;
username=username.toLowerCase();
var password=document.login.password.value;
password=password.toLowerCase();
if (username=="david" && password=="west") { window.location="david.htm"; done=1; }
if (username=="bob" && password=="west") { window.location="bob.htm"; done=1; }
if (username=="jim" && password=="west") { window.location="jim.htm"; done=1; }
if (username=="bill" && password=="west") { window.location="bill.htm"; done=1; }
if (username=="payment" && password=="wwp") { window.location="payment_center.htm"; done=1; }
if (done==0) { alert("Invalid login!"); }
}