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I hope the following link helps :
1. showModelessDialog Method
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/ref
erence/methods/showmodaldialog.asp
2. showHelp Method
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/ref
erence/methods/showmodaldialog.asp
3. See the below Link for more details , A breif summary is below :
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/om/window
s_frames_dialogs.asp
Showing a Help Window :
=======================
You can show help files in the browser using the showHelp method on the
window object. The following example creates a help window that would
display an HTML help file. For HTML Help, there are no modifying
parameters, and only defaults will apply to the new window.
<BUTTON onclick="window.showHelp('helpinfo.htm')">Show Help</BUTTON>
You can also use the showHelp method to display WinHelp files. To display
WinHelp files, the first parameter of the showHelp method specifies an .hlp
file, the second parameter specifies a context identifier, and the third
(optional) parameter can be used to specify "popup". The default view for
help files is to show the help file in the main browser window. If "popup"
is specified for WinHelp files, the help file is displayed in a separate
window.