var imageFiles_4t0_1 = new Array();
imageFiles_4t0_1['0'] = new Array ('_images/4t0_Back_to_Jack_s_Pg__1.gif', '_images/4t0_Back_to_Jack_s_Pg__1Mouseover.gif');

function image_on_4t0_1 (position) {
   var doc = eval("document.image4t0_1" + position);
   doc.src = imageFiles_4t0_1[position][1];
}

function image_off_4t0_1 (position) {
   var doc = eval("document.image4t0_1" + position);
   doc.src = imageFiles_4t0_1[position][0];
}