function addCart(isbn){ 
	var vISBN    
  vISBN = isbn    
    
  for( var i=0; i<document.Myform.elements.length; i++) {
	var ele = document.Myform.elements[i];		
	if (ele.value == vISBN ){
		if (ele.checked == false ){
			  ele.checked = true;
		}
	}	
	}
  
  document.Myform.action = "../shop/shop.html";
  document.Myform.submit();
  
  }