var imageFiles_q4_19 = new Array();
imageFiles_q4_19['0'] = new Array ('_images/q4_Telescopes.gif', '_images/q4_TelescopesMouseover.gif');

function image_on_q4_19 (position) {
   var doc = eval("document.imageq4_19" + position);
   doc.src = imageFiles_q4_19[position][1];
}

function image_off_q4_19 (position) {
   var doc = eval("document.imageq4_19" + position);
   doc.src = imageFiles_q4_19[position][0];
}