var lastBook=0;
function buch_change(arg) {
	document.getElementById("div_"+lastBook).style.display="none";
	document.getElementById("readerframe").style.display="none";
	document.getElementById("div_"+arg).style.display="block";
	lastBook = arg;
}

// correctly handle PNG transparency in Win IE 5.5 or higher.
function correctPNG() 
   {
   for(var i=0; i<document.images.length; i++)
      {
	  var img = document.images[i]
	  var imgName = img.src.toUpperCase()
	  if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
	     {
		 var imgID = (img.id) ? "id='" + img.id + "' " : ""
		 var imgClass = (img.className) ? "class='" + img.className + "' " : ""
		 var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
		 var imgStyle = "display:inline-block;" + img.style.cssText 
		 if (img.align == "left") imgStyle = "float:left;" + imgStyle
		 if (img.align == "right") imgStyle = "float:right;" + imgStyle
		 if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle		
		 var strNewHTML = "<span " + imgID + imgClass + imgTitle + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
	     + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader" + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
		 img.outerHTML = strNewHTML
		 i = i-1
	     }
      }
}

if (!window.XMLHttpRequest) {	// < IE7 !
       window.attachEvent("onload", correctPNG);
}

// Blaettern-Funktion
$(document).ready(function(){ 
	setTimeout ('$("#flip_left").css("display", "none");', 250);
	setTimeout ('$("#flip_right").css("display", "none");', 250);

	/* left page turner */
	$("#leftpage").click( function() {
	if ($pageYpos == 0)
		return;
	$pageYpos = $pageYpos + $pageheight; // update Y postion
	$("#leftpage").css("background-position", "0px "+$pageYpos+"px");// move the background position

	$("#flip_center").css("display", "none");
	$("#flip_left").css("display", "block");
	setTimeout ('$("#flip_center").css("display", "block");', 250);
	setTimeout ('$("#flip_left").css("display", "none");', 250);
	setTimeout ('$("#rightpage").css("background-position", $pagewidth+"px "+$pageYpos+"px");', 250);
	});

	/* right page turner */
	$("#rightpage").click( function() {
	if ($pageYpos <= -1 * ($pageheight * ($pageYposPages/2-1)) )
		return;
	$pageYpos = $pageYpos - $pageheight; // note: minus page height
	$("#rightpage").css("background-position", $pagewidth+"px "+$pageYpos+"px");

	$("#flip_center").css("display", "none");
	$("#flip_right").css("display", "block");
	setTimeout ('$("#flip_center").css("display", "block");', 250);
	setTimeout ('$("#flip_right").css("display", "none");', 250);
	setTimeout ('$("#leftpage").css("background-position", "0px "+$pageYpos+"px");', 250);
	});
});

// Funktionen für Steckbrief Kalle und Maja (unverändert übernommen)
function zeigeSteckbrief(index) {
	document.getElementById("steckbrief0"+index).style.display="block";
}

function drucken() {
   	if (window.print)
      		window.print()
	else
      		window.alert("Drucken leider nicht möglich!")
}