function swapclass(obj,strClassName){obj.className = strClassName;}
function clearList(obj){var list = document.getElementById(obj);while (list.length > 0) list.remove(0);}
function movepic(img_name,img_src){document[img_name].src=img_src;}
function changeChecked(id){obj = document.getElementById(id);if (obj.checked)obj.checked = false;else obj.checked = true;}