where to put script, head, body when using masterpage

I'm successfully using a masterpage for all my .aspx's... the below is typical... where though can I place script such as this into my .aspx below since I don't really use a head/body?:
<script runat="server">
    <System.Web.Services.WebMethod()> _
    <System.Web.Script.Services.ScriptMethod()> _
    Public Shared Function GetDropDownContentsPageMethod(ByVal knownCategoryValues As String, _
        ByVal category As String) As AjaxControlToolkit.CascadingDropDownNameValue()
        Return New CarsService().GetDropDownContents(knownCategoryValues, category)
    End Function
</script>
________________________________________________________________  
<%@import Namespace="System.Data ...