function $(id){return typeof id == 'object' ? id : document.getElementById( id );}
function classAdd(id, name){ $(id).className += ' '+name; }
function classRemove(id, name){ $( id ).className = $( id ).className.replace(new RegExp('\\b'+name+'\\b'), ' '); }
function classMatch(id, name){ return $( id ).className.match( new RegExp('\\b'+name+'\\b') ); }