newWindow=true;

function zar() {

	if(newWindow && !newWindow.closed && newWindow.open) {
		newWindow.close();
		newWindow=null;
	}
}

function nyit(URL, Width, Height) {

	zar();

	var Left = (screen.width-Width)/2;
	var Top = (screen.height-Height)/2;
	
	newWindow = window.open(URL,"","width="+Width+",height="+Height+",left="+Left+",top="+Top+", scrollbars=0, status=0, toolbar=0, menubar=0");
	newWindow.focus();
}

function nyitScroll(URL, Width, Height) {

	zar();

	var Left = (screen.width-Width)/2;
	var Top = (screen.height-Height)/2;
	
	newWindow = window.open(URL,"","width="+Width+",height="+Height+",left="+Left+",top="+Top+", scrollbars=1, status=0, toolbar=0, menubar=0");
	newWindow.focus();
}