var subs=new Array('sub1','sub2','sub3','sub4');
    
  function hideall(){
    for(x=0; x<subs.length;x++){
      document.getElementById(subs[x]).style.visibility='hidden';
    }
  }
    
  function display(mode,ele){
    if(mode=='s'){
      hideall();
      document.getElementById(ele).style.visibility='visible';
    }else{
      document.getElementById(ele).style.visibility='hidden';
    }
  }