Adding clear cart button to the showcart view

-- HikaShop version -- : 2.6.4

Hi ,
I am using showcart view in a pop up window.
I want to add a button (same as proceed to checkout) that clears the cart contents, I tried to add it like the (proceed to checkout) button ,although it's indeed clearing the cart but it is changing the contents of the pop up window, I want it to close the window(just like the proceed to checkout button does) and redirects the main browser page to the listing page
here's the code I am using

$clear_url=hikashop::completeLink('product&task=cleancart',false,true);
echo $this->cart->displayButton('Clear Cart','clearcart',$this->params, $clear_url,'window.location=\''.$clear_url.'\'; return false;');

I must say, the integration with iframe pop up of joomla is seamless and handy ,
I have worked out the "choose options" to work inside a pop up too , but faced couple issues,
1- I figured out how to create a hyper link that shows the choose options view in a popup , but I would like to use the same standard button (via displayButton helper method) to create the same behavior , so how to pass the needed parameters to the displayButton? (like class = modal and the other parameters)
following is the code I used to display it in hyperlink

<a class="modal" rel="{handler: 'iframe', size: {x: 760, y: 480}}" href="<?php echo hikashop_completeLink('product&task=show&product_id='.$this->row->product_id.'&name='.$this->row->alias.$url_itemid.$this->category_pathway,$this->row ,true);?>" > Choose Options</a>

Hi
thanks it works fine now,
for the display of the link , I actually need to put the link in an article too, but it's not opening the popup , instead it's is opening a new page,
how to solve this issue in joomla ? I checked with firebug, I am getting exactly the same html of the link, but it works in product listing and doesn't work in article
I searched a little, I found solutions to enable iframes in articles, but couldn't find these options in my back end, beside I think they are talking about embedding iframe inside joomla article not with a hyperlink.
I know it's not really related to hikashop , but I appreciate if you can give me a hit on that