var imageFiles_2_1 = new Array();
imageFiles_2_1['0'] = new Array ('_images/2_Main_Pool.gif', '_images/2_Main_PoolMouseover.gif');

function image_on_2_1 (position) {
   var doc = eval("document.image2_1" + position);
   doc.src = imageFiles_2_1[position][1];
}

function image_off_2_1 (position) {
   var doc = eval("document.image2_1" + position);
   doc.src = imageFiles_2_1[position][0];
}