var imageFiles_q3_4 = new Array();
imageFiles_q3_4['0'] = new Array ('_images/q3_Portables.gif', '_images/q3_PortablesMouseover.gif');

function image_on_q3_4 (position) {
   var doc = eval("document.imageq3_4" + position);
   doc.src = imageFiles_q3_4[position][1];
}

function image_off_q3_4 (position) {
   var doc = eval("document.imageq3_4" + position);
   doc.src = imageFiles_q3_4[position][0];
}