var imageFiles_16_21 = new Array();
imageFiles_16_21['0'] = new Array ('_images/16_Home.gif', '_images/16_HomeMouseover.gif');
imageFiles_16_21['1'] = new Array ('_images/16_Shop_Online.gif', '_images/16_Shop_OnlineMouseover.gif');
imageFiles_16_21['2'] = new Array ('_images/16_Treatments.gif', '_images/16_TreatmentsMouseover.gif');
imageFiles_16_21['3'] = new Array ('_images/16_Vouchers.gif', '_images/16_VouchersMouseover.gif');
imageFiles_16_21['4'] = new Array ('_images/16_Book_an_Appointment.gif', '_images/16_Book_an_AppointmentMouseover.gif');
imageFiles_16_21['5'] = new Array ('_images/16_Contact_Us.gif', '_images/16_Contact_UsMouseover.gif');
imageFiles_16_21['6'] = new Array ('_images/16_Enquiry_Form.gif', '_images/16_Enquiry_FormMouseover.gif');

function image_on_16_21 (position) {
   var doc = eval("document.image16_21" + position);
   doc.src = imageFiles_16_21[position][1];
}

function image_off_16_21 (position) {
   var doc = eval("document.image16_21" + position);
   doc.src = imageFiles_16_21[position][0];
}