Add multiple products in one click

<a class="hikashop_html_add_to_cart_link" href="http://www.proeco.ch/ProEco/index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=<?php    
		
		
		if (($nombre_douche <= $nombre_robinet) OR ($nombre_douche <= $nombre_robinet_cuisine)){ 
        			$nombre_pack = $nombre_douche;
        				echo $nombre_douche;        			
        			}else{ 
        				$nombre_pack = '0';
        			echo '0';
        			
        				}
		 	 		 	 
		 	 ?>&checkout=1&product_id=46,http://www.proeco.ch/ProEco/index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=<?php $cal_naxos = ($nombre_douche - $nombre_pack);
        if ($cal_naxos <= '0'){
        			$cal_naxos_val = '0';
        			echo '0';
		}else{ 
        			$cal_naxos_val = $cal_naxos;
        			echo $cal_naxos;}  ?>&checkout=1&product_id=19,http://www.proeco.ch/ProEco/index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=<?php  $cal_air45 = ($nombre_robinet - $nombre_pack);
        		if ($cal_air45 <= '0'){
        			$cal_air45_val= '0';
        				echo '0';
        			}else{
        				$cal_air45_val = $cal_air45;
        				echo $cal_air45; } ?>&checkout=1&product_id=10,http://www.proeco.ch/ProEco/index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=<?php  $cal_air60 = ($nombre_robinet_cuisine - $nombre_pack); 
        		if ($cal_air60 <= '0'){
        			$cal_air60_val = '0';
         			echo '0';
         			}else{
         				$cal_air60_val = $cal_air60;
         				echo $cal_air60;}?>&checkout=1&product_id=11" class="btn btn-primary btn-lg">Commander</a>

...&quantity=1,3,2,5&product_id=11,13,15,16