function showSubItems(name, a_id){
    if(name){
        var item=document.getElementById(name);
      	if(item){
            if(item.style.visibility=='visible'){
                item.style.visibility='hidden';
                item.style.position='absolute';
                item.style.display='none';
                //document.getElementById(a_id).value='+';
                document.getElementById(a_id).innerHTML='<img src="/images/exp.gif" border="0">';
                //document.getElementById(a_id).blur();
		return;
            }
            else{
                item.style.visibility='visible';
                item.style.position='relative';
                item.style.display='block';
                //document.getElementById(a_id).value='-';
                document.getElementById(a_id).innerHTML='<img src="/images/contr.gif" border="0">';;
                //document.getElementById(a_id).blur();
                return false;
            }
        }
        return;
    }
}