Magento: Add to cart button in related products on product detail page

<form action="<?php echo $this->getAddToCartUrl($_item) ?>" method="post" id="product_addtocart_form_<?php echo $_item->getId()?>"<?php if($_item->getOptions()): ?> enctype="multipart/form-data"<?php endif; ?>> 
	<?php if(!$_item->isGrouped()): ?> 
		<input type="text" name="qty" id="qty" maxlength="12" value="<?php echo ($this->getMinimalQty($_item)?$this->getMinimalQty($_item):1) ?>" /> 
		<label for="qty"><?php echo $this->__('Qty') ?>:</label> 
	<?php endif; ?> 
	<button type="button" onclick="this.form.submit()"><span><span><span><?php echo $this->__('Add to Cart') ?></span></span></span></button>
</form>