var active = new Array();
 function openclosemenu(num) { 
   if (active[num]!=true) {
     document.getElementById('arrow'+ num).src='/images/left_menu_arrow_active.gif';
	 document.getElementById('addmenu'+ num).style.display='block';
	 active[num]=true;
	 } else {
	     document.getElementById('arrow'+ num).src='/images/left_menu_arrow.gif';
		 document.getElementById('addmenu'+ num).style.display='none';
		 active[num]=false;
	   }
   }
 function choseequipment(num,type) {
	  closeequipment(num);
      document.getElementById(num).style.display='none';
	  document.getElementById(type+num).style.display='block';
	  
   }
 function closeequipment(num) {
      document.getElementById(num).style.display='block';
	  document.getElementById('oilclean'+num).style.display='none';
	  document.getElementById('filtration'+num).style.display='none';
	  document.getElementById('biological'+num).style.display='none';
	  
   }
 function rewindtype(name,num) {
	  selNum = name.selectedIndex;
	  if (selNum==4) { choseequipment(num,'oilclean'); }  else if (selNum==8) { choseequipment(num,'filtration');}  else if (selNum==10) { choseequipment(num,'biological');} else closeequipment(num);
   }