/* Rotator */
var position = 0;
var goal = 0;
var auto = 0;
var slideSize = 578;

function slide(target) {
	if(position == goal) { 
		slider = document.getElementById('slideshow').getElementsByTagName('ul')[0];
		end = (slider.getElementsByTagName('li').length * slideSize);
		if(target == 'next') {
			target = position + slideSize;
			if(target >= end) { 
				target = 0;
			}
		}

		if(target == 'prev') {
			target = position - slideSize;
			if(target < 0) {
				target = end - slideSize;
			}
		}
		goal = target;
		original_difference = goal - position;
		breaking_point = Math.abs(original_difference) / 5;
		speed = Math.round(original_difference / 20);

		document.getElementById('slide_menu_' + Math.round(position / slideSize)).src='/grafik/slider_prik.gif';
		document.getElementById('slide_menu_' + (target / slideSize)).src='/grafik/slider_prik_on.gif';

		smooth_move();
	}
}

function smooth_move() {
	if(position != goal) {
		difference = goal - position;
		distance = Math.abs(difference);
		if(distance <= breaking_point) {
			move = Math.round(speed * (distance / breaking_point)); 
			if(move == 0) {
				if(difference > 0) {
					move = 1;
				} else {
					move = -1;
				}
			}
			position += move;
		} else { 
			position += speed;
		}

		slider.style.right = position + 'px';
		setTimeout("smooth_move();", 25);
	}
}

function autoSlide() {
	if(auto == 1) {
		slide('next');
		setTimeout("autoSlide();", 9000);
	}
}

function startAutoSlide() {
	auto = 1;
	setTimeout("autoSlide();", 9000);
}

function stopAutoSlide() {
	auto = 0;
}

function setSlideWidth(size) {
	slideSize = size;
}