function windowOpen(Url, Width, Height, Name) {
	if (navigator.userAgent.indexOf('Opera') >= 0) {
		var ow = document.body.clientWidth, oh = document.body.clientHeight;
	} else {
		var ow = screen.width, oh = screen.height;
	}
	Width = Width || 640;
	Height = Height || 480;
	var left = (ow - Width)/2;
	var top = (oh - Height)/2;

	var feats = new Array("width=" + Width, "height=" + Height, "left=" + left, "top=" + top, "scrollbars=1", "status=1", "resizable=1");

	if (!Name) Name = Url.replace(/([\W]+)/g, '');
/*	if (Url == '') {
		Url = 'about:blank';
	} else {
		var base = document.getElementsByTagName('base');
		Url = base[0].href+Url;
	}*/

	window.open(Url,Name,feats.join(',')).focus();
}