function sei_cssclass_switch(obj,from,to){
if (obj && obj.className>''){
if (from == '' && to != '')
obj.className = sei_elementlist_add(obj.className, to, ' ');
if (from != '' && to == '')
obj.className = sei_elementlist_del(obj.className, from, ' ');
if (from != '' && to != '')
obj.className = sei_elementlist_replace(obj.className, from, to, ' ');}}
function sei_cssclass_add(obj,key){
obj.className = sei_elementlist_add(obj.className, key, ' ');}
function sei_cssclass_del(obj,key){
obj.className = sei_elementlist_del(obj.className, key, ' ');}
function sei_cssclass_check(obj,key){
return sei_elementlist_check(obj.className, key, ' ');}