var imageFiles_12_21 = new Array();
imageFiles_12_21['0'] = new Array ('_images/12_HOME.gif', '_images/12_HOMEMouseover.gif');
imageFiles_12_21['1'] = new Array ('_images/12_EQUIPMENT.gif', '_images/12_EQUIPMENTMouseover.gif');
imageFiles_12_21['2'] = new Array ('_images/12_CONTACT_US.gif', '_images/12_CONTACT_USMouseover.gif');
imageFiles_12_21['3'] = new Array ('_images/12_ABOUT_US.gif', '_images/12_ABOUT_USMouseover.gif');
imageFiles_12_21['4'] = new Array ('_images/12_SERVICES.gif', '_images/12_SERVICESMouseover.gif');

function image_on_12_21 (position) {
   var doc = eval("document.image12_21" + position);
   doc.src = imageFiles_12_21[position][1];
}

function image_off_12_21 (position) {
   var doc = eval("document.image12_21" + position);
   doc.src = imageFiles_12_21[position][0];
}