// preview_open():
// open the preview image

function preview_open(url, img, x, y, id2){
	var id = 'popup_preview';
	var delta_y = 0;
	var p = document.getElementById(id);

	y = parseInt(y) + 80;
	
	if(body.scrollTop != null){
		delta_y = body.scrollTop;
		p.style.top = y / 2 + 185 + delta_y;
	} else {
		p.style.top = '50%';		
	}

	rollover(id2, 0);	


	p.style.width = '0px';
	p.style.height = '0px';
	p.style.marginLeft = (-1)*(x / 2) + 'px';
	p.style.left = '50%';
	p.style.marginTop = (-1)*(y / 2) + 'px';

	url = url + '&img=' + img;
	ajax_anfrage(url, id, x, y, '80');
}

// preview_close():
// open the preview image

function preview_close(){
	id = 'popup_preview';
	var p = document.getElementById(id);
	x = p.style.width;
	y = p.style.height;
	
	fade(id, 0, x, y, '80');
}