function encrypt_url($string)
{
	$key = "1AT2#mr(luv^iU3tp>";
	$result = '';
	for($i=0; $i<strlen($string); $i++)
	{
		$char = substr($string, $i, 1);
		$keychar = substr($key, ($i % strlen($key))-1, 1);
		$char = chr(ord($char)+ord($keychar));
		$result.=$char;
	}
	return urlencode(base64_encode($result));
}

var my_url=document.getElementById('url').value;

// my_url='http://www.test.com';

var final_post_url=<?=encrypt_url(my_url)?>;
alert(final_post_url);