function open_win( file ) {
		var string, LeftPosition, TopPosition;
		LeftPosition = (screen.width) ? (screen.width-400)/2 : 0;
		TopPosition = (screen.height) ? (screen.height-400)/2 : 0;
		window.open('window.php?f='+file,'','width=400,height=400,resizable=no,top='+TopPosition+', left='+LeftPosition+', location=no,fullscreen=no')
			
	}