<p>I need a Javascript application that, when run, prompts a password to be entered, and if the password is correct, the script causes the webpage to close. If the password is incorrect, the script prompts for the password to be entered again.</p>

<p>I'm planning on loading this script onto my cell phone, which doesn't have a password-protected keylock feature.</p>

Ok, we can have two approuches.
We can all read javascript, so if the person actually open your code he will see the password.
By ajax, check the password in a specific page.
```
```
function passWrdAPI() {
    this.getHX = function() {
        var hx;
        try {
            hx = new XMLHttpRequest();
        }
        catch(e) {
            try {
                hx = new ActiveXObject("Microsoft.XMLHttp");
            }
            catch(ex) {
                hx = new ActiveXObject("Msxml2.XMLHttp");
            }
        }
        return hx;
    }

    this.password = "mypass";
    this.checkPwd = function(pass) {
        if (pass != this.password) {
            // Or close or redirect
            alert('Wrong!');

            window.close(); //or
            location.href = 'http://www.google.com';
        }
    }
    this.checkPwdPage(page, pass) {
        var hx = this.getHX();
        if (hx != null) {
            hx.open('GET',page + "?mypwd=" + pass);
            hx.onreadystatechange = function() {
                if (hx.readyState == 4) {
                    if (hx.responseText == 'false') {
                        // Or close or redirect
                        alert('Wrong!');

                        window.close(); //or
                        location.href = 'http://www.google.com';
                    }
                }           
            }
            hx.send(null);
        }
        else {
            alert('error!');
        }
    }
}
```
```
Usage:
```
for the first approach:

var check = new passWrdAPI();
check.checkPwd(THEPASSENTERED);

 for the second:

var check = new passWrdAPI();
check.checkPwdPage(YOURPAGE, THEPASS);
```
I don't know if it will work on your cell phone =/
Sorry if I don't help.. bye bye!