var imageFiles_nh_1 = new Array();
imageFiles_nh_1['0'] = new Array ('_images/nh_Contact_Us.gif', '_images/nh_Contact_UsMouseover.gif');

function image_on_nh_1 (position) {
   var doc = eval("document.imagenh_1" + position);
   doc.src = imageFiles_nh_1[position][1];
}

function image_off_nh_1 (position) {
   var doc = eval("document.imagenh_1" + position);
   doc.src = imageFiles_nh_1[position][0];
}