otwarte=0;
function OpenWindow(url,w,h) {
	if (document.all) { 
		var xMax = screen.width, yMax = screen.height
	} 
	else if (document.layers) {
		var xMax = window.outerWidth, yMax = window.outerHeight
	} 
	else {
		var xMax = 640, yMax=480}; 
		var xOffset = (xMax - w)/2, yOffset = (yMax - h)/2;
	{
	if (otwarte==1) {
		if (noweokno.closed) {
			otwarte=0
		} else {
			noweokno.close();
			otwarte=0
		}
	};
	noweokno=window.open(url,'okno','resizable=yes, scrollbars=no, width='+w+', height='+h+',screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
	otwarte=1;
	}
}