var imageFiles_13_19 = new Array();
imageFiles_13_19['0'] = new Array ('_images/13_Biscuits.gif', '_images/13_BiscuitsMouseover.gif');
imageFiles_13_19['1'] = new Array ('_images/13_Chews_n__bones.gif', '_images/13_Chews_n__bonesMouseover.gif');
imageFiles_13_19['2'] = new Array ('_images/13_Meaty_Treats.gif', '_images/13_Meaty_TreatsMouseover.gif');
imageFiles_13_19['3'] = new Array ('_images/13_Wheat_Free.gif', '_images/13_Wheat_FreeMouseover.gif');
imageFiles_13_19['4'] = new Array ('_images/13_Grain_Free.gif', '_images/13_Grain_FreeMouseover.gif');

function image_on_13_19 (position) {
   var doc = eval("document.image13_19" + position);
   doc.src = imageFiles_13_19[position][1];
}

function image_off_13_19 (position) {
   var doc = eval("document.image13_19" + position);
   doc.src = imageFiles_13_19[position][0];
}