Доставка товара в зависимости от общей суммы заказа - Плагины оплаты и доставки

<?php if (($cart->getSum(0,1)<300)&&($payment->payment_id==10)){?>disabled<?php } ?>

<?php
	$cart = &JModel::getInstance('cart', 'jshop');
    $cart->load("cart");
	?>
	
<input type = "radio" name = "payment_method" id = "payment_method_<?php print $payment->payment_id ?>" onclick = "showPaymentForm('<?php print $payment->payment_class ?>')" value = "<?php print $payment->payment_class ?>"                <?php if (($cart->getSum(0,1)<300)&&($payment->payment_id==10)){?>disabled<?php } ?>                              <?php if ($this->active_payment==$payment->payment_id){?>checked<?php } ?> />

      <input type = "radio" name = "payment_method" id = "payment_method_<?php print $payment->payment_id ?>" onclick = <?php if (($cart->getSum(0,1)<300)&&($payment->payment_id==10)){?>"this.checked=false; alert('Sorry, this option is not available!')"<?php } ?>  "showPaymentForm('<?php print $payment->payment_class ?>')" value = "<?php print $payment->payment_class ?>"                                           <?php if ($this->active_payment==$payment->payment_id){?>checked<?php } ?> />
    

      <input type = "radio" name = "payment_method" id = "payment_method_<?php print $payment->payment_id ?>" onclick = "showPaymentForm('<?php print $payment->payment_class ?>')" value = "<?php print $payment->payment_class ?>" <?php if ($this->active_payment==$payment->payment_id){?>checked<?php } ?> />
      <label for = "payment_method_<?php print $payment->payment_id ?>"><?php
      if ($payment->image){
        ?><span class="payment_image"><img src="<?php print $payment->image?>" alt="<?php print htmlspecialchars($payment->name)?>" /></span><?php
      }
      ?>

<?php
	$cart = &JModel::getInstance('cart', 'jshop');
    $cart->load("cart");
	?>
	
<input type = "radio" name = "payment_method" id = "payment_method_<?php print $payment->payment_id ?>" onclick = "showPaymentForm('<?php print $payment->payment_class ?>')" value = "<?php print $payment->payment_class ?>"                <?php if (($cart->getSum(0,1)<300)&&($payment->payment_id==10)){?>disabled<?php } ?>                              <?php if ($this->active_payment==$payment->payment_id){?>checked<?php } ?> />