function sei_th_over(obj){
sei_cssclass_add(obj,'over');
if (sei_cssclass_check(obj,'active') && sei_cssclass_check(obj,'over'))
sei_cssclass_add(obj,'active_over');}
function sei_th_out(obj){
sei_cssclass_del(obj,'over');
sei_cssclass_del(obj,'active_over');}
function sei_tr_over(obj){
sei_cssclass_switch(obj,'','over');}
function sei_tr_out(obj){
sei_cssclass_switch(obj,'over','');}