<body onKeydown=tab()>
<input type=text><input type=text><input type=text><input type=text><input type=text><input type=text><input type=text>
</body>
<script>
function tab(){
if(event.keyCode==13){
event.keyCode=9
}
//alert(event.keyCode)
}
</script>
<input type=text><input type=text><input type=text><input type=text><input type=text><input type=text><input type=text>
</body>
<script>
function tab(){
if(event.keyCode==13){
event.keyCode=9
}
//alert(event.keyCode)
}
</script>
<form onkeydown = "if(event.keyCode==13)event.keyCode=9 " id="Form1" method="post" runat="server">
<INPUT id=tb1 type="text">
<INPUT type="text">
<INPUT type="text">
<INPUT type="text">
<INPUT type="text">
</form>
</body>
<form onkeydown = "if(event.keyCode==13)event.keyCode=9 " id="Form1" method="post" runat="server">
<INPUT id=tb1 type="text">
<INPUT type="text">
<INPUT type="text">
<INPUT type="text">
<INPUT type="text">
</form>
</body>
<HEAD>
<title>WebForm1</title>
</HEAD>
<body>
<form id="WebForm1" method="post" runat="server">
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
<asp:TextBox id="TextBox2" runat="server"></asp:TextBox>
<br/>
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
</form>
<script language="javascript">
function WebForm1.onkeydown(){
with(window.event)if(srcElement.type=="text"&&keyCode==13)keyCode=9
}
</script>
</body>
</HTML>