var imageFiles_3c_31 = new Array();
imageFiles_3c_31['0'] = new Array ('_images/3c_Birds.gif', '_images/3c_BirdsMouseover.gif');

function image_on_3c_31 (position) {
   var doc = eval("document.image3c_31" + position);
   doc.src = imageFiles_3c_31[position][1];
}

function image_off_3c_31 (position) {
   var doc = eval("document.image3c_31" + position);
   doc.src = imageFiles_3c_31[position][0];
}