function popOpen(required,version){
	if (version.major >= required){
	if (!win){
		var scw = screen.width;
		var sch = screen.height;
		var t = (sch-500)/2;
		var w = Math.min(1024,scw);
		var l = (scw-w)/2;
		var screenprops = 'width='+w+',height=500,left='+l+',top='+t+',status=no,scrollbars=no,resizable=no';
		var win = window.open('main.html', 'newwnd', screenprops) || false;
		if (win && parseInt(navigator.appVersion) >= 4) { 
			win.window.focus(); 
		}
	} else{
		win.window.focus(); 
	}
	}
}