var currentPrefix = ''
function showImg(prefix, imgNum) {
    currentPrefix = prefix;
    var tempObj = document.getElementById('mainImg');
    tempObj.src = 'images/photos/' + prefix + '_' + imgNum + '.jpg';

}
function resetImg() {
    return;
    var tempObj = document.getElementById('mainImg');
    tempObj.src = 'images/photos/' + currentPrefix + '_1.jpg';
}