Адекватное изменение количества товаров в корзине - [VM2&3] Дизайн, оформление

<input type="text"
				   onblur="Virtuemart.checkQuantity(this,<?php echo $step?>,'<?php echo vmText::_ ('COM_VIRTUEMART_WRONG_AMOUNT_ADDED')?>');"
				   onclick="Virtuemart.checkQuantity(this,<?php echo $step?>,'<?php echo vmText::_ ('COM_VIRTUEMART_WRONG_AMOUNT_ADDED')?>');"
				   onchange="Virtuemart.checkQuantity(this,<?php echo $step?>,'<?php echo vmText::_ ('COM_VIRTUEMART_WRONG_AMOUNT_ADDED')?>');"
				   onsubmit="Virtuemart.checkQuantity(this,<?php echo $step?>,'<?php echo vmText::_ ('COM_VIRTUEMART_WRONG_AMOUNT_ADDED')?>');"
				   title="<?php echo  vmText::_('COM_VIRTUEMART_CART_UPDATE')?>" class="quantity-input js-recalculate" size="3" maxlength="4" name="quantity[<?php echo $pkey; ?>]" value="<?php echo $prow->quantity ?>" />

	$(function(){
		$('a.prminus').click(function() {
			var $input = $(this).parent(this).children("input");
			var count = parseInt($input.val()) - 1;
			$(this).parent(this).children("input").val(count);
			$(this).parent(this).children(".vm2-add_quantity_cart").click();
		});
		$('a.prplus').click(function() {
			var $input = $(this).parent(this).children("input");
			var count = parseInt($input.val()) + 1;
			$(this).parent(this).children("input").val(count);
			$(this).parent(this).children(".vm2-add_quantity_cart").click();
		});
	});

$(function(){
	$('.quantity-plus,.quantity-minus').on('click',function() {
		var 
			signs={'quantity-plus':1,'quantity-minus':-1},
            el=$(this).parent().prev().find('.quantity-input'),
            step=el.attr('step') || 1,
			cls=$(this).attr('class'),
			cl=cls.substring(cls.indexOf(' ')).trim(),
			val=parseInt(el.val())+signs[cl]*step
		;
		val=val<step?step:val;
		el.val(val);
	});
});

$(function(){
	$('.quantity-plus,.quantity-minus').on('click',function() {
		var 
			signs={'quantity-plus':1,'quantity-minus':-1},
			el=$(this).parent().prev('.quantity-input'),
			step=parseInt(el.attr('onblur').replace(/[^\d]/g,'')) || 1,
			cls=$(this).attr('class'),
			cl=cls.substring(cls.indexOf(' ')).trim(),
			val=parseInt(el.val())+signs[cl]*step
		;
		val=val<step?step:val;
		el.val(val);
		$(this).parent().nextAll('span').filter('.vm2-add_quantity_cart').first().click();
	});
});