function compute(f) {
  var xSMTP= "smtp.oasysoft.com";
  var xSender = "info@oasysoft.com" ;
  var xRecipients = "davidwilliams@oasysoft.com";
  var xSubject = "Hello World!";
  var xMessage = f.expr.value;

 h1=makehash(f.expr.value,3);
 if (h1 != f.password.value)
   alert("Incorrect Password ! ")
 else
  if (f.password.value == null || f.password.value == "")
   alert("Missing email ..." )

  else
 
   window.location="http://oasysoft.com/download2.html";
   sendMail(xSMTP,xSender,xRecipients,xSubject,xMessage);
  
   
  }

function makehash(pw,mult) {
var alpha="AB4CDEFG0HIJKLM9N1OPQ23RSTUV5WXY6ZAB7CD8EFGHI _.";
var pass=pw.toUpperCase();
var hash=0;
var letter ="";
for (i=0;i<pw.length;i++) {
letter=pass.substring(i,i+1);
c=alpha.indexOf(letter,0)+1;
hash=hash*mult+c;
}
return(hash);
}