var imageFiles_51_39 = new Array();
imageFiles_51_39['0'] = new Array ('_images/51_.gif', '_images/51_Mouseover.gif');

function image_on_51_39 (position) {
   var doc = eval("document.image51_39" + position);
   doc.src = imageFiles_51_39[position][1];
}

function image_off_51_39 (position) {
   var doc = eval("document.image51_39" + position);
   doc.src = imageFiles_51_39[position][0];
}