webuser controle in asp.net aspx page

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ASP.NET

Javascript

C#3.5

i am using webuser controle in that page i wrote one javascript funtion for text box ,then how to call that javascript function in another aspx page .

like for example:

SampleWebusercontrole.ascx in that page
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<script type="text/javascript">
 function QuantityChange()
 {
   //our Code
 }
</script>

<asp:textbox id="txtquantity" runat="server" onchange="QuantityChange()"/>
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sample.aspx
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in this page i want use that javascript function

how to call that javascript function in sample.aspx not in sample.aspx.cs
pls help me....

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