[JavaScript] TextBox, keydown, other page..

[noahssite]

Hello on my website i have a textbox on the first page. I want it so the users enter a specific password in the textbox, click the enter key on their keyboard and/or a button on the screen and then if the password for example eqauls "12345" then the user will advance to "http://www.mywebsite.com/secretpage.html".

Also since the above website is suppose to be a 'secretpage' i dont want the user able to just type that link on the addressbar and bypass my password. What can i do about this?

[noahssite]

I don't need it so much encrypted etc.. so i am using this code:

<script language="javascript">
var pswrd = "321369"
var confirmation = prompt("Please enter the password below! If you enter an incorrect password you will be transfered to the homepage!")
if (confirmation==pswrd) {
alert("Password correct! You may continue.")
}
else
{
alert("Password invalid! You will now be transfered to the homepage!")
window.location = "\Index.html"
}
</script>