var imageFiles_4b_1 = new Array();
imageFiles_4b_1['0'] = new Array ('_images/4b_Home.gif', '_images/4b_HomeMouseover.gif');
imageFiles_4b_1['1'] = new Array ('_images/4b_About_Us.gif', '_images/4b_About_UsMouseover.gif');
imageFiles_4b_1['2'] = new Array ('_images/4b_Feedback.gif', '_images/4b_FeedbackMouseover.gif');
imageFiles_4b_1['3'] = new Array ('_images/4b_Contact_Us.gif', '_images/4b_Contact_UsMouseover.gif');

function image_on_4b_1 (position) {
   var doc = eval("document.image4b_1" + position);
   doc.src = imageFiles_4b_1[position][1];
}

function image_off_4b_1 (position) {
   var doc = eval("document.image4b_1" + position);
   doc.src = imageFiles_4b_1[position][0];
}