[Rise]

Lobezki,

<input type="text" id="input1" value="" maxlength="8">
<input type="text" id="input2" value="" maxlength="8">
<script>
var x = document.getElementById('input1');
var y = document.getElementById('input2');
	x.focus();
	x.onkeyup = x.onpaste = y.onkeyup = y.onpaste = function(){
		var z = this;
		setTimeout(function(){
			z.value = z.value.replace(/[^\d]/g, '');
			if (z.value.length == 8) {
				y.focus();
				// AJAX запрос
			}
		}, 0);
	};
</script>