var imageFiles_ds_1 = new Array();
imageFiles_ds_1['0'] = new Array ('_images/ds_CONTACT_US.gif', '_images/ds_CONTACT_USMouseover.gif');

function image_on_ds_1 (position) {
   var doc = eval("document.imageds_1" + position);
   doc.src = imageFiles_ds_1[position][1];
}

function image_off_ds_1 (position) {
   var doc = eval("document.imageds_1" + position);
   doc.src = imageFiles_ds_1[position][0];
}