[рони]

MixPetrov,

function isright(product_id) {
	var ns = +($('input[name=\'' + product_id + '\']').val().replace(/\D/g,''))||0;
	if (ns>50)	ns=50;	
        if (ns<10)  ns=10;
	$('input[name=\'' + product_id + '\']').val(ns) }