Javascript - Text Field Submits To A Popup Window

I need to have this logic ( textfield ) (submit button) Person enters a string of numbers/letters - if its right; a popup window happens showing a pdf. if its wrong validation happ

Solution 1:

HTML:

<form onsubmit="return false;">
    <input type="text"/>
    <input type="submit"/>
</form>
​

Javascript:

$('form').submit(function() {
    if ($('input[type=text]').val() == "some_pdf.pdf") {
        window.open("http://link_to_some_pdf.com/some_pdf.pdf");
    } else if ($('input[type=text]').val() == "some_other_pdf.pdf") {
        window.open("http://link_to_some_other_pdf.com/some_other_pdf.pdf");
    }  else {
        alert("Not a valid PDF! Try again!");
    }
});

​

jsfiddle: http://jsfiddle.net/vu26C/