var imageFiles_a_1 = new Array();
imageFiles_a_1['0'] = new Array ('_images/a_Home.gif', '_images/a_HomeMouseover.gif');

function image_on_a_1 (position) {
   var doc = eval("document.imagea_1" + position);
   doc.src = imageFiles_a_1[position][1];
}

function image_off_a_1 (position) {
   var doc = eval("document.imagea_1" + position);
   doc.src = imageFiles_a_1[position][0];
}