// PopUp öffnen
function popup( url, width, height ) {
	oeffner = window.open( url, 'popup', 'width='+width+', height='+height+', left='+((screen.width-width)/4)+', top='+((screen.height-height)/4)+', toolbar=no, menubar=no, scrollbars=yes, status=no, location=no, resizable=yes' );
}

// PopUp Größe anpassen
function popup_resize( width, height) {
	if ( width == 0 && height == 0 ) {
		width = document.getElementById('picture').width + 60;
		if ( width < 450 ) width = 450;
		height = document.getElementById('picture').height + 90;
	}
	if ( screen.availWidth > width ) {
		moveX = (screen.availWidth-width)/2;
	} else {
		width = screen.availWidth;
		moveX = 0;
	}
	if ( screen.availHeight > height ) {
		moveY = (screen.availHeight-height)/3;
	} else {
		height = screen.availHeight;
		moveY = 0;
	}
	window.resizeTo( width, height );
	window.moveTo( moveX, moveY );
}