var imageFiles_by_5 = new Array();
imageFiles_by_5['0'] = new Array ('_images/by_Melbourne.gif', '_images/by_MelbourneMouseover.gif');

function image_on_by_5 (position) {
   var doc = eval("document.imageby_5" + position);
   doc.src = imageFiles_by_5[position][1];
}

function image_off_by_5 (position) {
   var doc = eval("document.imageby_5" + position);
   doc.src = imageFiles_by_5[position][0];
}