if (ck==true){
    $.post("rpc.f", {credenU: ""+user+"", credenP: ""+pass+"", mns: 1}, function(data){
	if(data.length >0) {
	    $('#serverlisted').html(data);
	}
    });
}
else{
    $.post("rpc.f", {credenU: ""+user+"", credenP: ""+pass+""}, function(data){
	if(data.length >0) {
	    $('#serverlisted').html(data);
	}
    });        

##</code><code>##

which is either
{credenU: ""+user+"", credenP: ""+pass+"", mns: 1}
or
{credenU: ""+user+"", credenP: ""+pass+""}
based on value of mms