var imageFiles_18_13 = new Array();
imageFiles_18_13['0'] = new Array ('_images/18_PRODUCTS.gif', '_images/18_PRODUCTSMouseover.gif');
imageFiles_18_13['1'] = new Array ('_images/18_SERVICES.gif', '_images/18_SERVICESMouseover.gif');
imageFiles_18_13['2'] = new Array ('_images/18_CONTACT_US.gif', '_images/18_CONTACT_USMouseover.gif');
imageFiles_18_13['3'] = new Array ('_images/18_FEED_BACK.gif', '_images/18_FEED_BACKMouseover.gif');

function image_on_18_13 (position) {
   var doc = eval("document.image18_13" + position);
   doc.src = imageFiles_18_13[position][1];
}

function image_off_18_13 (position) {
   var doc = eval("document.image18_13" + position);
   doc.src = imageFiles_18_13[position][0];
}