// JavaScript Document
function checkSelectedItem() {
   var obj_list_box = document.form1.category;
   var string_list_box = "";
   var productcode = document.form1.productcode.value;
   
   for (i = 0; i < obj_list_box.length; i++) {
    	if (obj_list_box.options[i].selected == true) {
			string_list_box = obj_list_box.options[obj_list_box.selectedIndex].value;
		}
	}
   
   if (productcode == "" && string_list_box == "") {
		alert("Please select either a product category or a product code");
		return false;
	}
   if (string_list_box.length < 3 && productcode == "") {
		alert("Please select a sub level (e.g. Addressing)");
		return false;
	}
	if (string_list_box != "" && productcode != "") {
		alert("Please select either a product category or a product code");
		document.form1.productcode.value = "";
		return false;
	}
	return true;
}