<!--
function cao_divdisplay(div_,img_,img_open,img_close){
with(document){
switch(all[div_].style.display){
       case"none":all[div_].style.display="";all[img_].src=img_open;break;
	   case"":all[div_].style.display="none";all[img_].src=img_close;break;}
}
}
//-->