var imageFiles_18_1 = new Array();
imageFiles_18_1['0'] = new Array ('_images/18_Home.gif', '_images/18_HomeMouseover.gif');
imageFiles_18_1['1'] = new Array ('_images/18_About_Us.gif', '_images/18_About_UsMouseover.gif');
imageFiles_18_1['2'] = new Array ('_images/18_Contact_Us.gif', '_images/18_Contact_UsMouseover.gif');
imageFiles_18_1['3'] = new Array ('_images/18_Feedback.gif', '_images/18_FeedbackMouseover.gif');

function image_on_18_1 (position) {
   var doc = eval("document.image18_1" + position);
   doc.src = imageFiles_18_1[position][1];
}

function image_off_18_1 (position) {
   var doc = eval("document.image18_1" + position);
   doc.src = imageFiles_18_1[position][0];
}