function OpenPopUp	(PopUpUrl,Params)
{
	//window.showModalDialog ("GuestBookSendMail.php")
	
	WOffset = 0;
	FoundIndex = Params.search ("width=");
	if (FoundIndex != -1)
	{
		WOffset = (screen.availWidth / 2) - (Params.substr (FoundIndex + 6,3) / 2);
	}
	
	HOffset = 0;
	FoundIndex = Params.search ("height=");
	if (FoundIndex != -1)
	{
		HOffset = (screen.availHeight / 2) - (Params.substr (FoundIndex + 7,3) / 2);
	}
	
	MyWd = window.open (PopUpUrl,"",Params+",left="+WOffset+",top="+HOffset);
	MyWd.focus ();
}