Toggle field on/off deopending on the length of another field

I am looking for some javascript to hide/show a div depending on the length of the string in a separate input field. For example; if the input field is the first line of an address and is less than 5 characters then hide the submit button.
cdjohn31Asked:
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Ray PaseurCommented:
Please see http://iconoun.com/demo/temp_cdjohn31.php
<!DOCTYPE html>
<html dir="ltr" lang="en-US">
<head>

<!-- SEE http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_28507149.html -->

<meta charset="utf-8" />
<meta name="robots" content="noindex, nofollow" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
$(document).ready(function(){
    $("#subm").hide();
    $("#addr").keyup(function(){
        len = $("#addr").val().length;
        if (len > 4){
            $("#subm").show();
        }
    });
});
</script>

<title>HTML5 Page in UTF-8 Encoding</title>
</head>
<body>

<form>
<input id="addr">
<input id="subm" type="submit" value="OK, Go!" />
</form>

</body>
</html>

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This is about the minimum needed to do the trick.  Please post back if you have any questions.
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