function change_city()
{
  var city_ul = document.getElementById('city_ul');

  if(city_ul.style.display == "none"){
		var html = document.getElementById('city_name').innerHTML;
		li = document.getElementById('city_ul').getElementsByTagName('a');
		for(i in li){
			if(li[i].innerHTML == html){
				li[i].parentNode.className += ' over';
			}
		}
		document.getElementById('city_ul').style.display = 'block';
	}else{
		city_ul.style.display = "none";
	}
	//setTimeout(function(){document.getElementById('city_ul').style.display = 'none';},6000);
}
function chg(id_num){
         var oa = document.getElementById(id_num);
         var ob = document.getElementById("test_a");
         if(oa.style.display == "block"){
                 oa.style.display = "none";
                 
         }else{
                 oa.style.display = "block";
                
         }
         return false;
}