function Login() {                       
    if(document.forms[0].login_name.value == "") {
        alert("Please fill in your login name");      
        document.forms[0].login_name.select();
        return;
    }
    if(document.forms[0].login_pwd.value == "") {
        alert("Please fill in your password");
        document.forms[0].login_pwd.select(); return;
    }
    document.forms[0].submit();
}            


##</code><code>##

 my sourceWebSite="http://xxxxxxxx";
 my $agent = WWW::Scripter->new();
 my $code;

 $agent->use_plugin(JavaScript =>
                       engine => "JE",
 );

 $agent->get("$sourceWebSite");

 $agent->plugin('JavaScript')->set(
          $agent,'document','forms[0]','login_name','value'=> 'xxxxxx'
    );

    $agent->plugin('JavaScript')->set(
           $agent,'document','forms[0]','login_pwd','value'=> 'xxxxxx'
    );


##</code><code>##

 $agent->eval($code,"JavaScript",$sourceWebSite);