function mg_wopen_wh(url,gWindowWidth,gWindowHeight) {
	var st = 'width=' + gWindowWidth;
	st += ',';
	st += 'height=' + gWindowHeight;
	st += ',';
	var cw = (screen.width / 2) - (gWindowWidth / 2);
	var ch = (screen.height / 2) - (gWindowHeight / 2);
	if (navigator.userAgent.indexOf('MSIE') != -1) {
		st += 'left=' + cw;
		st +=',';
		st += 'top=' + ch;
	}else if (navigator.userAgent.indexOf('Mozilla') != -1) {
		st += 'screenX=' + cw;
		st += ',';
		st += 'screenY=' + ch;
	}
	st += "resizable=yes, scrollbars=yes, menubar=yes, directories=0, status=0, location=0";
	newwindow = window.open(url, 'sub', st);
	newwindow.focus();
}