<div id="balance" data-value="1630">Баланс: 1 630,0 юаней</div>
<input type="checkbox" class="checkbox" id="checkbox9" name="photo_attach_check" {attach_photo}><label for="checkbox9">Я с чекбоксом</label>
<script>
$(document).ready(function(){
var balance = $("#balance").data("value");
if(balance < 19)
$("#checkbox9").attr("disabled", true);
else $("#checkbox9").attr("disabled", false);
});
</script>