var win = null; 
function newWindow(mypage,myname,w,h,features) 
{ 
	var winl = (screen.width-w)/2; 
	var wint = (screen.height-h)/2;
	if (winl < 0)
	{
		winl = 0; 
	}
	
	if (wint < 0)
	{
		wint = 0; 
	}
	
	var settings = 'height=' + h + ',';
	 settings += 'width=' + w + ','; 
	settings += 'top=' + wint + ','; 
	settings += 'left=' + winl + ','; 
	settings += features; 
	win = window.open(mypage,myname,settings); win.window.focus(); 
}