function openWindow(urlin, widthin, heightin, windownamein)
{


	var url;
	var windowname;
	var width;
	var height;


	if (typeof(urlin) == "undefined" || urlin=="")
	{
		alert("keine URL uebergeben");
	}
	else
	{
		url=urlin;
	}


	if (typeof(windownamein) == "undefined" || windownamein=="")
	{
		windowname="newWindow";
	}
	else
	{
		windowname=windownamein;
	}


	if (typeof(widthin) == "undefined" || widthin=="")
	{
		width=600;
	}
	else
	{
		width=widthin;
	}


	if (typeof(heightin) == "undefined" || heightin=="")
	{
		height=400;
	}
	else
	{
		height=heightin;
	}


	if (typeof(urlin) != "undefined")
	{
		window.open(url,windowname,"menubar=no,scrollbars=yes,toolbar=no,location=no,resizable=yes,width="+width+",height="+height+",status=no,left=50,top=50");
	}

}

function reloadOpener()
{
	if (checkOpener())
	{
		opener.location.reload();	}
	else
	{
		alertMessage();
	}
}


function reloadOpenerAndCloseThis()
{
	if (checkOpener())
	{
	opener.location.reload();
	opener.focus();
	this.close();
	}
	else
	{
		alertMessage();
	}
}


function checkOpener()
{
	if (opener.closed){
		return false;
		} else {
			return true;
			}
}


function checkOpenerWindow()
{
	if (checkOpener())
	{
		alert("noch da!!!");
	}
	else
	{
		alert("fenster geschlossen!!!");
	}
}



function alertMessage()
{
	alert("Unterfenstergeschlossen, daher Ausführung nicht möglich!!!");
}