var imageFiles_yx_1 = new Array();
imageFiles_yx_1['0'] = new Array ('_images/yx_Instructions.gif', '_images/yx_InstructionsMouseover.gif');

function image_on_yx_1 (position) {
   var doc = eval("document.imageyx_1" + position);
   doc.src = imageFiles_yx_1[position][1];
}

function image_off_yx_1 (position) {
   var doc = eval("document.imageyx_1" + position);
   doc.src = imageFiles_yx_1[position][0];
}