use javascript, for example, for IE, try something like<script language="javascript">
var SHIFT_TAB = 38;
var TAB = 40;function document.onkeydown()
{
var e = event.srcElement;
if (event.keyCode == SHIFT_TAB)
changeFocus(e,-1);
else if (event.keyCode == TAB)
changeFocus(e,1);
}function changeFocus(ele, n)
{
var index = ele.sourceIndex+n;
var o = null;
while (index < document.all.length && index >= 0)
{
o = document.all[index];
if(o.tagName == "INPUT" || o.tagName == "SELECT" || o.tagName == "A" )
break;
else
{
index += n;
}
} if (index < document.all.length && index >= 0)
o.focus();
}
</script>
var SHIFT_TAB = 38;
var TAB = 40;function document.onkeydown()
{
var e = event.srcElement;
if (event.keyCode == SHIFT_TAB)
changeFocus(e,-1);
else if (event.keyCode == TAB)
changeFocus(e,1);
}function changeFocus(ele, n)
{
var index = ele.sourceIndex+n;
var o = null;
while (index < document.all.length && index >= 0)
{
o = document.all[index];
if(o.tagName == "INPUT" || o.tagName == "SELECT" || o.tagName == "A" )
break;
else
{
index += n;
}
} if (index < document.all.length && index >= 0)
o.focus();
}
</script>
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