var imageFiles_n_21 = new Array();
imageFiles_n_21['0'] = new Array ('_images/n_ORTHO_K.gif', '_images/n_ORTHO_KMouseover.gif');
imageFiles_n_21['1'] = new Array ('_images/n_Preventive_Eye_Exam.gif', '_images/n_Preventive_Eye_ExamMouseover.gif');
imageFiles_n_21['2'] = new Array ('_images/n_Difficult_to_Fit_Contacts.gif', '_images/n_Difficult_to_Fit_ContactsMouseover.gif');
imageFiles_n_21['3'] = new Array ('_images/n_Designer_Glasses.gif', '_images/n_Designer_GlassesMouseover.gif');
imageFiles_n_21['4'] = new Array ('_images/n_Lasik_Co_management.gif', '_images/n_Lasik_Co_managementMouseover.gif');

function image_on_n_21 (position) {
   var doc = eval("document.imagen_21" + position);
   doc.src = imageFiles_n_21[position][1];
}

function image_off_n_21 (position) {
   var doc = eval("document.imagen_21" + position);
   doc.src = imageFiles_n_21[position][0];
}