<form action="http://bs....." method="post" id="product_addtocart_form">
  ....
   <div class="add_to_box_con">
    <div class="qty_con">
        <div class="add-to-box removeaddcart_con">
             <div class="add-to-cart">
                <label class="qty_label" for="qty">Quantity:</label>
                <div class="qty_pan">
                <input type="text" name="qty" id="qty" maxlength="12" value="1" title="Qty" class="input-text qty">
                <div class="inc add">›</div><div class="dec add">‹</div><div class="inc add">›</div><div class="dec add">‹</div></div>
                <button type="button" title="Add to Cart" class="button btn-cart" onclick="productAddToCartForm.submit(this)"><span><span>Add to Cart</span></span></button>
            </div>
         </div>

 .....


 <div class="add_to_cart_links_con">
 <div class="add_to_cart_con">
     <div class="add-to-cart">
      <label class="qty_label" for="qty">Quantity:</label>
       <div class="qty_pan">
        <input type="text" name="qty" id="qty" maxlength="12" value="1" title="Qty" class="input-text qty">
....
            </form>

<?php echo $this->getBlockHtml('formkey'); ?>

<input type="hidden" name="form_key" value="<?php echo Mage::getSingleton('core/session')->getFormKey(); ?>" />

<form action="<?php echo $this->getAddToCartUrl($_product) ?>" method="post" id="product_addtocart_form">
    <?php echo $this->getBlockHtml('formkey'); ?>

<form action="<?php echo $this->getUrl('checkout/cart/updatePost') ?>" method="post">
    <?php echo $this->getBlockHtml('formkey'); ?>