You have added jQuery files multiple times so remove the following and try
<script src='<%=ResolveUrl("Scripts/datepicker-jquery-1.10.2.js")%>'></script>
<script src='<%=ResolveUrl("Scripts/datepicker-jquery-1.10.2.js")%>'></script>
<link href="Styles/datepicker-jquery-ui-1.10.4.custom.min.css" rel="stylesheet" />