function add(prod_id)
{ 
  var str ='/cards?cmd=add&id='+prod_id;
  
  new Ajax.Request(str, { method: 'get',parameters:{},
		onSuccess: function (transport){ changeCart(transport.responseText); }} );

}

function add_prod(prod_id)
{ 

  var str ='/products?cmd=add&id='+prod_id;
  
  new Ajax.Request(str, { method: 'get',parameters:{},
		onSuccess: function (transport){ changeCart(transport.responseText); }} );

}

function onSuccess(transport)
{
  alert(transport.responseText);
  //$('prod_num').value=number;
}

// 
function  complete()
{
  alert('a request completed');
}

function changeCart(num)
{

 // alert(num);
  
  //document.getElementById('shopcart').innerHTML = num;
	
	document.getElementById('shopcart').innerHTML= num;
	
 if ((num%10==1)&&((num>20)||(num<10))) 
	 document.getElementById('shopcart').innerHTML += " товар";
 else 	
  if (((num%10==2)||(num%10==3)||(num%10==4))&&((num>20)||(num<10)))
	  document.getElementById('shopcart').innerHTML += " товара";
  else 
	  document.getElementById('shopcart').innerHTML += " товаров";
  
 
}