our page http://www.ehotelsindia.com/delhi.htm is linked to
http://www.ehotelsindia.com , but on trying to find backward links to
the page using google toolbar, it is not showing any link.There must
be 10 other similar links, but none is shown.

Why is it so??

Greetings, mollee! 
 
We gets lots of questions from website owners wanting to know why the
links: search method won't show that any pages link to their website,
even though they KNOW for a fact that such pages exist.
   
Because of Google's secrecy, it is not known for absolute certain, but
the general consensus among experienced webmasters who have
extensively studied Google's "backward links" function pretty much
agree that if a URL has a Page Rank less than 4, the link: function
will not work, and that if it has a Page Rank of 4 or higher, the
link: function will only return pages with a Rank of 4 or higher:
    
From Senior Forum Member "Beachboy" at WebmasterWorld:      
"Your index page is PR3, Google won't show any inbound links unless
the page you're doing the query on is PR4 or greater."
http://www.webmasterworld.com/forum3/4784.htm
      
From Senior Forum Member "Birdman" at WebmasterWorld:      
"It is thought that Google only shows backlinks from pages that have a
pr4 or higher."
http://www.webmasterworld.com/forum3/7309.htm
   
Because your Page Rank is 2, the "backward links" function will not
show other websites that link to your site, no matter how many
websites link to your site.
 
For this reason, you may want to search for pages that link to your
site by simply entering the URL into the Google Search box. Using this
method and clicking on the "contain the term" link will show you pages
that link to you REGARDLESS of their Page Rank.

This is especially useful while you are trying to work your site's
Page Rank up to a PR4, since using the link: / links: command will not
show you your backward links if your PR is less than 4.
  
------------------------------------------------------------   
Sorry, no information is available for the URL
www.ehotelsindia.com/delhi.htm

Find web pages that contain the term "www.ehotelsindia.com/delhi.htm"
------------------------------------------------------------   
://www.google.com/search?q=http://www.ehotelsindia.com/delhi.htm 
 
However, in this case, it looks as if your page has not been indexed
by Google, so perhaps that is why the link from the main page
http://www.ehotelsindia.com is not shown.

I hope that this Answer provided the information that you were
seeking!
 
Regards, 
 
aceresearcher