function roll(img_name, img_src) { document[img_name].src = img_src + ((cropped) ? 'c.jpg' : '.jpg'); }
function hide(img_name) { document[img_name].style.display = 'none'; }
function show(img_name) { document[img_name].style.display = 'inline'; }
function matches_any_flags(i) { for(j=0;j<10;j++){ if (image_flags[i][j] && !flags[j]){return true;} } return false; }
function filter_all() { for(i=0;i<num_images;i++){ filter(i); } }
function filter(i) { if (matches_any_flags(i)) {hide((i+1).toString()); } else {show((i+1).toString());} }
function crop_all() { for(i=0;i<num_images;i++){ crop(i); } }
function crop(i) { im_name=(i+1).toString(); document[im_name].src = im_name + ((!cropped) ? '.jpg' : 'c.jpg'); }