function OpenPictureViewer(url,bild,popup_width,popup_height) {
	
	status_height=20;

	xsize = popup_width;
	ysize = popup_height+status_height;
	    
	ScreenWidth = screen.width;
	ScreenHeight = screen.height;
	
	xpos = (ScreenWidth/3)-(xsize/3);
	ypos = (ScreenHeight/3)-(ysize/3);
		
	window.open(url + "?Bild=" + bild,"Picture","height="+ysize+",width="+xsize+",scrollbars=no,resizable=no,top="+ypos+",left="+xpos+"");
}