function janela( pageToLoad, winName, width, height, center, barra) { 
	xposition=0;
	yposition=0;
	if ((parseInt(navigator.appVersion) >= 4 ) && (center)){
		xposition = (screen.width - width) / 2;
		yposition = (screen.height - height) / 2;
	} 
	args = "width=" + width + "," 
	+ "height=" + height + "," 
	+ "location=0," 
	+ "menubar=0,"
	+ "resizable=0,"
	+ "scrollbars=" + barra + ","
	+ "status=0," 
	+ "titlebar=no,"
	+ "toolbar=0,"
	+ "hotkeys=0,"
	+ "z-lock=1," //Netscape Only
	+ "screenx=" + xposition + "," //Netscape Only
	+ "screeny=" + yposition + "," //Netscape Only
	+ "left=" + xposition + "," //Internet Explore Only
	+ "top=" + yposition; //Internet Explore Only
	window.open( pageToLoad,winName,args );
}