Question about Javascript

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http://www.daniweb.com – well I want to know if javascript works well with asp controls for example: here is simple example: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title></title>     <script language="javascript" type="text/javascript">             function exe() {                 var a = parseInt(document.getElementById("txt").value);                 var b = parseInt(document.getElementById("txt1").value);                 document.getElementById("txt2").value = a - b;             }         </script> </head> <body>     <form id="form1" runat="server">     <div>         <asp:TextBox ID="txt" runat="server" />         <asp:TextBox ID="txt1" runat="server" />         <asp:TextBox ID="txt2" runat="server" />         <asp:Button runat="server" Text="Click Me"  OnClientClick="return exe()"  />         <input type="button" value="Click" onclick="return exe()" />     </div>     </form> </body> </html> when I clik on asp button it runs postback, but when I click on HTML button there is not postback... is it my browser's fault??... (General)