> But, i am getting gif images
> in the tmp folder. :(

backblue.gif ? This is perfectly normal (this file is generated by httrack)

> (ii)For mentioning the deep level is the below code
> is correct or :-/
> httrack <http://tsunamihelp.blogspot.com/> -O
> /root/gube/tmp -r2 (deep level)

2 == two clicks from the top index.html (that is, first level links from the
given URL)

> (iii)Default it ignore external links. But, for
> spider external links is the
> below code is correct or :-/
> httrack <http://tsunamihelp.blogspot.com/> -O
> /root/gube/tmp %eN (deep level)

the - is missing, such as in, 
-%e1
(external link depth = 1)