function change_borough(theid){
   var thearray= new Array("tab_X","tab_B","tab_M","tab_Q","tab_R");
   var boroughTemp;
   for(i=0; i<thearray.length; i++){
      boroughTemp = browserGetElementObject(thearray[i]);
      if(boroughTemp != null){
      	if(thearray[i] == theid){
      		boroughTemp.style.display="block";
      		browserGetElementObject("li_id").className=theid+"_id";
      	}else{
      		boroughTemp.style.display="none";
      	}
      }
   }
}

//default
function set_default_borough(){
	change_borough('tab_X');
}