<!--

<script>
function num_chk() {
var ff = document.form;
for(i=0;i<ff.inpay.value.length;i++) {
if (ff.inpay.value.charAt(i)<'0' || ff.inpay.value.charAt(i)>'9') {
alert("숫자만 입력해주세요.") ;
return;
}
}
}
</script>

<form name=form>
<input name=inpay type=test value='abcd'>
</form>
<a href="javascript:num_chk();">테스트</a>




-->