aman204 the problem is, after I follow the suggestion on that theard, it changed all the signs to "plus", no matter if is open or close position it's all marked with "+" sign. I still want the open to be "minus" and closed to be "plus", but showing "closed/plus" as default view when people first visit the page. Does that make sense?
I still think saquaros suggestion will work, if you can help me understand the last part where he said to change the class inside a tag: '<?php if($i!=0) echo 'collapsed' ?>'
to 'collapsed'
Thanks!