<script src="http://code.jquery.com/jquery-latest.js"></script>
<script> function rs(){
var alpha = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; var length =11; var alpha_length = alpha.length; var s = '';//IMPORTANT
for(i=0; i<length; i++){
var r =Math.floor(Math.random()*alpha_length);
s += alpha.substr(r, 1);
}