var imageFiles_bw_11 = new Array();
imageFiles_bw_11['0'] = new Array ('_images/bw_Perth.gif', '_images/bw_PerthMouseover.gif');

function image_on_bw_11 (position) {
   var doc = eval("document.imagebw_11" + position);
   doc.src = imageFiles_bw_11[position][1];
}

function image_off_bw_11 (position) {
   var doc = eval("document.imagebw_11" + position);
   doc.src = imageFiles_bw_11[position][0];
}