var imageFiles_80_31 = new Array();
imageFiles_80_31['0'] = new Array ('_images/80_Home.gif', '_images/80_HomeMouseover.gif');
imageFiles_80_31['1'] = new Array ('_images/80_Contact_Us.gif', '_images/80_Contact_UsMouseover.gif');
imageFiles_80_31['2'] = new Array ('_images/80_About_Us.gif', '_images/80_About_UsMouseover.gif');
imageFiles_80_31['3'] = new Array ('_images/80_Video1.gif', '_images/80_Video1Mouseover.gif');

function image_on_80_31 (position) {
   var doc = eval("document.image80_31" + position);
   doc.src = imageFiles_80_31[position][1];
}

function image_off_80_31 (position) {
   var doc = eval("document.image80_31" + position);
   doc.src = imageFiles_80_31[position][0];
}