var imageFiles_s4_1 = new Array();
imageFiles_s4_1['0'] = new Array ('_images/s4__.gif', '_images/s4__Mouseover.gif');

function image_on_s4_1 (position) {
   var doc = eval("document.images4_1" + position);
   doc.src = imageFiles_s4_1[position][1];
}

function image_off_s4_1 (position) {
   var doc = eval("document.images4_1" + position);
   doc.src = imageFiles_s4_1[position][0];
}