function openWindow (url, name, features, myWidth, myHeight, isCenter) {
	
		if (features == "none") {
			features = "toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=no,resizable=no";
		}
		
		if (features == "all") {
			features = "toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes";
		}
	
		if (window.screen)
		if (isCenter)
		if (isCenter == "true") {
			var myLeft	=	(screen.width - myWidth) / 2;
			var myTop	=	(screen.height - myHeight) / 2;
			features	+=	(features != '') ? ',' : '';
			features	+=	',left=' + myLeft + ',top=' + myTop;
		}
		window.open (url, name, features + ((features != '') ? ',' : '') + 'width=' + myWidth + ',height=' + myHeight).focus();
	}
	function openFlexWindow (url, name, features, myWidth, myHeight, isCenter) {
		openWindow (url, name, features, myWidth, myHeight, isCenter);
	}
	
	function PopUp (doc,x_size,y_size) {
		openWindow (doc,"buch_de","none",x_size,y_size,"true");
	}
	
	function YellowMap (vst) {
		var url	=	"thalia.yellowmap.php?vst=" + vst;
		openWindow (url,"yellowmap","toolbar=yes,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes","665","570","true");
	}
	
	function redirect_opener (url) {
		if (window.opener) {
			opener.top.location = url;
		} else {
			openWindow (url,"buch_de","all","600","350","true");
		}
	}
	
	function FlashDetect () {
		if ((navigator.userAgent.indexOf("Mac_PowerPC") > 0) 
			&& (navigator.userAgent.indexOf("MSIE") > 0) 
			&& (navigator.userAgent.indexOf("4.5") > 0))
		{
			return false;				// PLain HTML-File without Plug-Ins
		}
		else
		{
			if ((navigator.appName == "Microsoft Internet Explorer" 
				&& navigator.appVersion.indexOf("Mac") == -1 
				&& navigator.appVersion.indexOf("3.1") == -1) 
				|| (navigator.plugins && navigator.plugins["Shockwave Flash"]) 
				|| navigator.plugins["Shockwave Flash 2.0"])
			{
				return true;			// Flash-PlugIn-savvy HTML file
			} else {
				return false;			// PLain HTML-File without Plug-Ins
			}
		}
	}
	
	function SwapImagesPreLoad (count,path) {			
	
		var loop_end = count++;
	
		Out = new Array (count);
		Over = new Array (count);
		
		for (i=1; i<loop_end; i++) {
			Out[i] = new Image();
			Out[i].src = path + "button." + i + ".0.gif";
			Over[i] = new Image();
			Over[i].src = path + "button." + i + ".1.gif";
		}
	
		path = "";
	}	
	
	// Initial swap function;
	function Swap(Nr,Obj) {
		window.document.images[Nr].src = Obj.src;
	}