Error in link include

Error in link include

Hello My Friend!

I have a problem, i'm begginer and show this problem in my browser:

Uncaught ReferenceError: jQuery is not defined
Uncaught TypeError: jQuery(...).css(...).datepicker is not a function

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>jQuery UI</title>
<meta name="" content="">
<link rel="stylesheet" type="text/css" href="../Scripts/jquery-ui-1.11.4.custom/jquery-ui.min.css"/>
<link rel="stylesheet" type="text/css" href="../Scripts/jquery-ui-1.11.4.custom/jquery-ui.structure.min.css"/>
<link rel="stylesheet" type="text/css" href="../Scripts/jquery-ui-1.11.4.custom/jquery-ui.theme.min.css"/>
<script type="text/javascript" src="../Scripts/jquery-ui-1.11.4.custom/jquery-ui.min.js"></script>
<script type="text/javascript" src="../Scripts/jquery-ui-1.11.4.custom/external/jquery/jquery.js"></script>
<script type="text/javascript" src="../Scripts/jquery-1.12.0.min.js"></script>
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery("#date").css("background-color", "red").datepicker();
});
</script>
</head>
<body>
<div>
Date: <input type="text" id="date">
</div>
</body>
</html>

I put all CSS and JS that I can see in folder, but show this message.

Help me please, i don't know what to do more.