how to print the form in asp.net 2.0?

<script type="text/javascript" language="javascript">
        function Callform(strid)
        {
        var textbox1_id =document.getElementById('textbox1');
        var textbox1_txt =textbox1_id.value;
       
        var content = document.getElementById("div1").innerHTML;
        alert(content);
        }
        </script>

<form id="form1" runat="server">
   <div id="div1">

       <input id="Button1"  onclick="javascript:Callform('form1')" runat="server" type="button" />

   </div>
   </form>