Note:
Opens a modeless dialog window.
Syntax:
window.showModelessDialog(param1, param2, param3)
Parameters:
param1 Required; the URL of the document to display.
param2 Optional; an object with added properties. The modeless 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..