function popup(url){
	//alert('Bildschirmauflösung: ' + screen.width + " x " + screen.height + "  " + screen.availWidth + " x " + screen.availHeight);
	settings  = 'height=500' //+ screen.availHeight;
	settings += ',width=600' //+ screen.availWidth;
	settings += ',top=' + (screen.availHeight/2-200);
	settings += ',left=' + (screen.availWidth/2-200);
	settings += ',menubar=0';
	settings += ',toolbar=0';
	settings += ',location=0';
	settings += ',directories=0';
	settings += ',status=1';
	settings += ',scrollbars=1';
	settings += ',resizable=0';
	settings += ',fullscreen=0';
	//alert(settings);
	win = window.open('', "popup_callback", settings);
	// win.moveTo(-10,-50);
	// win.resizeTo(screen.availWidth + 200,screen.availHeight + 200);
	win.location = url;

	//win.blur();
	win.focus();

}