function scroll_history(e){
	e = e || window.event;
	var dir = e.wheelDelta || e.detail;
	if(dir > 0){
		scroll_history_id --;
	}
	else{
		if(dir < 17){
			scroll_history_id ++;
		}
	}
	//console.log($("history_holder").scrollTop);
	var current_screen_width = document.body.clientWidth;
	if($("history_holder").scrollTop<1722 / max_screen_width * current_screen_width){
		$("history_year").innerHTML = "2016<br>|<br>2011";
	}
	if($("history_holder").scrollTop>1722 / max_screen_width * current_screen_width && $("history_holder").scrollTop<2622 / max_screen_width * current_screen_width){
		$("history_year").innerHTML = "2010<br>|<br>2006";
	}
	if($("history_holder").scrollTop>2622 / max_screen_width * current_screen_width && $("history_holder").scrollTop<3522 / max_screen_width * current_screen_width){
		$("history_year").innerHTML = "2005<br>|<br>2001";
	}
	if($("history_holder").scrollTop>3522 / max_screen_width * current_screen_width){
		$("history_year").innerHTML = "2000<br>|<br>1994";
	}
	//location.hash = "#event_" + scroll_history_id;
}

function highlight_intro_map_button(obj){
	obj.style.borderColor = "#084271";
}
function dehighlight_intro_map_button(obj){
	obj.style.borderColor = "#eaeaea";
}

function show_map(id){
	$("intro_map").style.backgroundImage = "url('images/intro_map_" + id + ".jpg')";
}
function init(){

}