html - jQuery Plugin Date and Time Picker creating issue in design -

i using jquery date time picker example works fine , somehow messes design.

heres code adding :

<link href="scripts/jquery.datetimepicker.css" rel="stylesheet" type="text/css" /> 

below code tried writing
after body ends
after html ends

<asp:textbox id="dob" runat="server" backcolor="#d7d7d7" bordercolor="#3399ff" borderstyle="groove"  text="" width="150px" autopostback="true" ontextchanged="dob_textchanged"   ></asp:textbox> 

<script type="text/javascript" src="scripts/jquery.js"></script> <script type="text/javascript" src="scripts/jquery.datetimepicker.js"></script> <script type="text/javascript">     jquery('[id$=dob]').datetimepicker({         startdate: '+1971/05/01'//or 1986/12/08     }); </script> 

if needs part of code let me know, long not putting yet.

thanks