var imageFiles_3r_1 = new Array();
imageFiles_3r_1['0'] = new Array ('_images/3r_Heating_and_Cooling.gif', '_images/3r_Heating_and_CoolingMouseover.gif');

function image_on_3r_1 (position) {
   var doc = eval("document.image3r_1" + position);
   doc.src = imageFiles_3r_1[position][1];
}

function image_off_3r_1 (position) {
   var doc = eval("document.image3r_1" + position);
   doc.src = imageFiles_3r_1[position][0];
}