function city_light_on(id)
{
	city_light_off();
	var memory = 'off';
	var list = document.getElementsByTagName('tr');
	for (i in list) 
	{
		if ( list[i].className == 'city_'+id )
		{
			list[i].style.background = '#D9D9D9';
			if(memory == 'off'){
				Element.scrollTo(list[i]);
				memory = 'on';
			}
		}
	}	
	//Element.scrollTo($('city_'+id));
}

function city_light_off()
{
	var list = document.getElementsByTagName('tr');
	for (i in list) 
	{
		if(list[i].className != undefined)
		{
			if ( list[i].className.substr(0,5) == 'city_' )
			{
				list[i].style.background = 'none';
			}
		}
	}			
}