var imageFiles_bw_3 = new Array();
imageFiles_bw_3['0'] = new Array ('_images/bw_Perth.gif', '_images/bw_PerthMouseover.gif');

function image_on_bw_3 (position) {
   var doc = eval("document.imagebw_3" + position);
   doc.src = imageFiles_bw_3[position][1];
}

function image_off_bw_3 (position) {
   var doc = eval("document.imagebw_3" + position);
   doc.src = imageFiles_bw_3[position][0];
}