Note:
Opens a model dialog.
Syntax:
window.showModalDialog(param1, param2, param3)
Parameters:
param1 Required; the URL of the document to display.
param2 Optional; an object with added properties.
The modal window will receive this object using its
dialogArguments property.
param3 Optional; a semicolon-delimited list of one or more of the style
attributes listed at
http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/showmodaldialog.asp..