Tab key not firing in TextChanged event in IE and Safari

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C#

ASP.NET

Hi all,

I have five textboxs each and every textbox having text_Textchanged event. after build in browser IE and Safari not firing when click on tab key. same issue was working in Firefox and Chrome. how to solve my issue..? give me any ideas

just now am added below javascript its working in IE browser, but not working in Safari my script

my script like this

<script language="JavaScript">

function ModifyEnterKeyPressAsTab() {

    if (window.event && window.event.keyCode == 9) {

        window.event.keyCode = 13;

    }

}

</script>

<asp:TextBox ID="txtOver1" runat="server" class="newtextbox"
                            AutoPostBack="True" ontextchanged="txtOver1_TextChanged" onKeyDown="return ModifyEnterKeyPressAsTab();" MaxLength="10"></asp:TextBox>

thanks and regards