function sei_cssclass_switch(obj,from,to)
{
	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, ' ');
}