function change_timeDiv(obj){
  var obj=document.getElementById(obj);
  var El_all=document.getElementById("ss5_timehistory");;    
  var El_all=El_all.getElementsByTagName("div");
  var idx=obj.options[obj.selectedIndex].value;    
  var  inidx=0;
  
  for(i=0;i<(El_all.length);i++){
  	  if(El_all[i].className=="ss5_subdiv"){
	  	inidx++;
		
		if(idx=="all"){ // all 
          El_all[i].style.display="block";  		  
        }
        else{ // Not all
          El_all[i].style.display="none";
		  if(i==(idx-1)){		 
            El_all[i].style.display="block";
          }
        }                          		
      }
  }  
}