Shop = {

	Amount: {
	
		keypress: function(event) {

			charCode = (event.which) ? event.which : event.keyCode;

			return (charCode >= 48 && charCode <= 57);
		},
		
		change: function(form) {

			if (form.amount.value < 1) { form.amount.value = 1; }
		},
		
		add: function(form) {
		
			form.amount.value++;
		},
		
		sub: function(form) {

			if (form.amount.value > 1) { 
			
				form.amount.value = form.amount.value - 1;
			}		
		}
	},
	
	Specificity: {
	
		change: function(price, id) {
	
			$('#price' + id).html(price.split('_')[1].replace('.', ','));					
		}
	}
};