ASP.NET - Jquery validation in external js file for aspx file

<script type="text/javascript" src="script/JQuery.js"></script>
 
    <script type="text/javascript">
    $(function(){
    $('#<%=btnedit.ClientID %>').click(function(){
 
    var Isvalid=true;
    var filter = /^[1-9][0-9]*$/
    if($('#<%= tbxarea.ClientID %>').val()=='')
    {
        $('#<%= tbxarea.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
        Isvalid=false;
    }
    else
    {
        if(filter.test($('#<%= tbxarea.ClientID %>').val()))
        {
            $('#<%= tbxarea.ClientID %>').css({"border-color": "",
             "border-width":"",
             "border-style":""});
        }
        else
        {
            $('#<%= tbxarea.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
            Isvalid=false;
        }
    }
 
    if($('#<%= tbxmatte.ClientID %>').val()=='')
    {
        $('#<%= tbxmatte.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
        Isvalid=false;
    }
    else
    {
        if(filter.test($('#<%= tbxmatte.ClientID %>').val()))
        {
            $('#<%= tbxmatte.ClientID %>').css({"border-color": "",
             "border-width":"",
             "border-style":""});
        }
        else
        {
            $('#<%= tbxmatte.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
            Isvalid=false;
        }
    }
    if($('#<%= tbxglossy.ClientID %>').val()=='')
    {
        $('#<%= tbxglossy.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
        Isvalid=false;
    }
    else
    {
        if(filter.test($('#<%= tbxglossy.ClientID %>').val()))
        {
            $('#<%= tbxglossy.ClientID %>').css({"border-color": "",
             "border-width":"",
             "border-style":""});
        }
        else
        {
            $('#<%= tbxglossy.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
            Isvalid=false;
        }
    }
    if($('#<%= tbxtextured.ClientID %>').val()=='')
    {
        $('#<%= tbxtextured.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
        Isvalid=false;
    }
    else
    {
        if(filter.test($('#<%= tbxtextured.ClientID %>').val()))
        {
            $('#<%= tbxtextured.ClientID %>').css({"border-color": "",
             "border-width":"",
             "border-style":""});
        }
        else
        {
            $('#<%= tbxtextured.ClientID %>').css({"border-color": "red",
             "border-width":"1px",
             "border-style":"solid"});
            Isvalid=false;
        }
    }
    return Isvalid;
    });
 
    });
    </script>
 
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Above is a jQuery function written in aspx page , how to implement the same in external js file