function processItem(list) {

    // Define what item_number was selected.

    var item_no;
    var index_no = list.selectedIndex;
    
    switch (index_no) {
        case 0:
            item_no = 'General';
            break;
        case 1:
            item_no = 'Tithe';
            break;
        case 2:
            item_no = 'MMSW';
            break;
    }

    document.paypal_form.elements['item_number'].value = item_no;
    alert (item_no);

}