var n_b_sem = true;

function next_button() {
	document.onkeydown = function(e){
		if (n_b_sem){var keynum = get_keyCode(e);
		if((keynum==13||keynum==32||keynum==39)&&document.getElementById('next_button')){window.location=document.getElementById('next_button').href;}}
		if(keynum==37) history.go(-1);
	};
}

function body_onload(){
	next_button();
	red_arrow();
}

function red_arrow(){
	if ($('red_arrow')) {
		setTimeout('red_arrow_bip()', (Math.floor(Math.random()*4)+2)*1000);
	}
}

function red_arrow_bip(){
	$('red_arrow').style.visibility='visible';
	setTimeout(function(){$('red_arrow').style.visibility='hidden';}, 200);
	setTimeout(function(){$('red_arrow').style.visibility='visible';}, 400);
	setTimeout(function(){$('red_arrow').style.visibility='hidden';}, 600);
}


function get_keyCode(e){if(!e)var e=window.event;if(e.keyCode)return e.keyCode;else if(e.which)return e.which;return 0;}
function $(a){return document.getElementById(a)};