var imageFiles_188_1 = new Array();
imageFiles_188_1['0'] = new Array ('_images/188_Historic_Valley.gif', '_images/188_Historic_ValleyMouseover.gif');

function image_on_188_1 (position) {
   var doc = eval("document.image188_1" + position);
   doc.src = imageFiles_188_1[position][1];
}

function image_off_188_1 (position) {
   var doc = eval("document.image188_1" + position);
   doc.src = imageFiles_188_1[position][0];
}