<ul>
<li id="unLi" class="unLi"><input class="text" id="userName" type="tex
+t" maxlength="15" /></li>
<li class="blank"></li>
<li id="pwLi" class="pwLi"><input class="text" id="pcPassword" type="p
+assword" maxlength="15"/></li>
                </ul>
[download]

unction CheckUserPswInvalid()
{
    var userName = $("userName");
    var pcPassword = $("pcPassword");    
    
    if(!CheckUserPswChars(userName.value))
    {
        userName.select();
        userName.focus();
        return false;    
    }
    
    if(!CheckUserPswChars(pcPassword.value))
    {
        pcPassword.select();
        pcPassword.focus();
        return false;    
    }
    
    return true;
}
[download]

Before you proceed it's worth also checking the form name.

Maybe all you want is to POST a form and get a cookie back?

I can't help with WWW::Scripter. But here is an idea about debugging: save html and all javascript dependencies locally, modify with alert() and point Scripter to these files to verify that the javascript plugin at least works.