var imageFiles_1z_22 = new Array();
imageFiles_1z_22['0'] = new Array ('_images/1z_Heating.gif', '_images/1z_HeatingMouseover.gif');
imageFiles_1z_22['1'] = new Array ('_images/1z_Boilers.gif', '_images/1z_BoilersMouseover.gif');
imageFiles_1z_22['2'] = new Array ('_images/1z_Cooling.gif', '_images/1z_CoolingMouseover.gif');
imageFiles_1z_22['3'] = new Array ('_images/1z_OHAC.gif', '_images/1z_OHACMouseover.gif');
imageFiles_1z_22['4'] = new Array ('_images/1z_Air_Quality.gif', '_images/1z_Air_QualityMouseover.gif');

function image_on_1z_22 (position) {
   var doc = eval("document.image1z_22" + position);
   doc.src = imageFiles_1z_22[position][1];
}

function image_off_1z_22 (position) {
   var doc = eval("document.image1z_22" + position);
   doc.src = imageFiles_1z_22[position][0];
}