<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6">
<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6" onkeydown="if(this.value.length==6)event.keyCode=9">
<input maxlength="6">
function keydown_handler(o){
if(o.value.length==6)
event.keyCode=9;
}
</script>
<input maxlength="6" type="text" onkeydown="keydown_handler(this);">
<input maxlength="6" type="text" onkeydown="keydown_handler(this);">
<input maxlength="6" type="text" onkeydown="keydown_handler(this);">
<input maxlength="6" type="text" onkeydown="keydown_handler(this);">
<input maxlength="6" type="text" onkeydown="keydown_handler(this);">
<input maxlength="6" type="text" onkeydown="keydown_handler(this);">