var imageFiles_n_13 = new Array();
imageFiles_n_13['0'] = new Array ('_images/n_.gif', '_images/n_Mouseover.gif');

function image_on_n_13 (position) {
   var doc = eval("document.imagen_13" + position);
   doc.src = imageFiles_n_13[position][1];
}

function image_off_n_13 (position) {
   var doc = eval("document.imagen_13" + position);
   doc.src = imageFiles_n_13[position][0];
}