id_valid = 0;
	box_number = document.getElementById('box_number').value; // number of checkboxes in product list
	inputs = document.getElementsByTagName('input');
	chosen_products = document.getElementById('chosen_products');
	url_id1 = document.getElementById('url_id').value;
	
	//is executed by clicking drop down button
	function get_div(){
		product_list = document.getElementById('choose').style;
		chosen_products = document.getElementById('chosen_products');

		if (product_list.display == 'none'){
			product_list.display = 'block';
		} else {
				chosen_products.value = '';
				fill_product_list ();
				product_list.display = 'none';
			}
	}

	if (url_id1){
		for (var i=1; i<inputs.length;i++){
			if (inputs[i].type.toLowerCase() == 'checkbox' && inputs[i].value == url_id1){
				id_valid = 1;
				inputs[i].checked = 1;
				chosen_products.value = inputs[i].value;
			}
		}
	} else {
			fill_product_list ();
		}

	if (id_valid == 0 && url_id1 != ''){
		fill_product_list ();
	}

 //fills product list
	function	fill_product_list (){
			var checked_boxes_exist = 0;
			 	for (var i=1; i<inputs.length;i++){
					if (inputs[i].type.toLowerCase() == 'checkbox' && inputs[i].checked == '1'){
						checked_boxes_exist = 1;

							if (chosen_products.value != ''){
								chosen_products.value += '; ';
							}
							chosen_products.value += inputs[i].value;
					}
				}

				if(checked_boxes_exist == 0){

				chosen_products.value = "Please choose a product";
				}
	}