var imageFiles_4_31 = new Array();
imageFiles_4_31['0'] = new Array ('_images/4_Home.gif', '_images/4_HomeMouseover.gif');
imageFiles_4_31['1'] = new Array ('_images/4_FAQ.gif', '_images/4_FAQMouseover.gif');
imageFiles_4_31['2'] = new Array ('_images/4_Feedback.gif', '_images/4_FeedbackMouseover.gif');

function image_on_4_31 (position) {
   var doc = eval("document.image4_31" + position);
   doc.src = imageFiles_4_31[position][1];
}

function image_off_4_31 (position) {
   var doc = eval("document.image4_31" + position);
   doc.src = imageFiles_4_31[position][0];
}