var dist = 10; // mehr=schneller 
var timer;
var but_oben = document.getElementById("infobars_ohne_twitter_button_oben");
var but_unten = document.getElementById("infobars_ohne_twitter_button_unten");
var element = document.getElementById('infobars_ohne_twitter_container'); 
var wheel = true;

function infobars_scroll(val){ 
	clearTimeout(timer); 
	y = element.scrollTop; 
	if (val == 1) y -= dist; 
	if (val == 2) y += dist; 
	if (y < element.scrollHeight - element.offsetHeight + dist && y > 0 - dist){ 
	element.scrollTop = y; 
	timer = setTimeout('infobars_scroll(' + val + ')', 50); 
	} 
	if(y <= 0 || y >= element.scrollHeight - element.offsetHeight){ 
		clearTimeout(timer); 
		scroll_ende = true;
		if (val == 1) {
			but_oben.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachoben_grau.gif)";
			but_oben.style.cursor = "default";
		}
		if (val == 2) {
			but_unten.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachunten_grau.gif)"; 
			but_unten.style.cursor = "default";
		}
	}
}
function infobars_start(val) {
	wheel = false
	scroll_ende = false;
	if (val == 1) {
		but_oben.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachoben_rot.gif)"; 
		but_unten.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachunten.gif)"; 
		but_unten.style.cursor = "pointer";
		infobars_scroll(val);
	}
	if (val == 2) {
		but_unten.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachunten_rot.gif)"; 
		but_oben.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachoben.gif)"; 
		but_oben.style.cursor = "pointer";
		infobars_scroll(val);
	}
}
function infobars_stop(val) {
	wheel = true;
	if (val == 1) {
		if (scroll_ende == false) but_oben.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachoben.gif)"; 
		clearTimeout(timer);
	}
	if (val == 2) {
		if (scroll_ende == false) but_unten.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachunten.gif)"; 
		clearTimeout(timer);
	}
} 
function wheel_scroll () {
	if (wheel == true) {
		if(element.scrollTop <= 0){ 
			but_oben.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachoben_grau.gif)";
			but_oben.style.cursor = "default";
		} else {
			but_oben.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachoben.gif)";
			but_oben.style.cursor = "pointer";
		}
		if(element.scrollTop >= element.scrollHeight - element.offsetHeight){ 
			but_unten.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachunten_grau.gif)";
			but_unten.style.cursor = "default";
		} else {
			but_unten.style.backgroundImage = "url(" + ptr + "/../global/images/infobar_nachunten.gif)";
			but_unten.style.cursor = "pointer";
		}
	}
}