I am looking for examples of the japanese kanji representations of the
phrases/word  " inner strengh" and "perseverance"- ( nin taii) . It is
my understanding that these two expressions can be written with two
Kanji expressions. Though I have seen them represented in four kanji
expressions also, it is the two kanji expression I am interested in.

Can you help?

Hi umassbear!
  
Inner Strength ("Kokoro ga tsuyoi")
http://www.futureimplications.com/images/innerstrength.gif
Main page
http://www.futureimplications.com/kanji_katakana_hiragana/kanji.htm
   
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"Inner Peace, Inner Strength" Kanji tattoo
http://www.angelfire.com/tv/Vertigo/photos/Kanji.jpg
Main page
http://www.angelfire.com/tv/Vertigo/pictures.html
    
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"Chikara" 
Meaning: strength; force; might; efforts; resources; capacity; talent.
Symbology: inner strength and intensity of love / the essence of true
strength that comes from within.
Examples:
http://www.cs.unm.edu/~cami/images/chikara.gif
http://images.google.com/images?q=www.bekkoame.ne.jp/~otake/kanji/
gifmoji/req/chikara.gif
http://www.res.otemon.ac.jp/~yoshida/images/chikara.jpg
  
Interpretation of "chikara" by Dyanne Williams
http://www.dyanne-personaltrainer.com/chikara.html
    
Jewelry based on Kanji calligraphy belonging to Japanese writing
http://www.lidajoyeria.com/colb-1-gb.htm
  
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Perseverance (nintai)
http://www.kushu.com/images/nintai.gif
Main page
http://www.kushu.com/kanji.htm
  
Perseverance (nintai)
http://budostuff.com/images/kaligrafie/nintai.jpg
Main page
http://budostuff.com/pol/kaligrafie/
  
Perseverance (nintai) - small picture
http://www.interphysical.com/bodysculpture-org/page007/index_files/image023.gif
Main page
http://www.interphysical.com/bodysculpture-org/page007/
  
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Perseverance (Kennin-fubatsu) 
http://japaneseculture.about.com/bl50kanji5_kenninfubatsu.htm
Main page
   
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I hope this is what you're looking for!
  
best wishes,
JACKBURTON-ga
  
  
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Search strategy:
  
In Google Image Search:
"inner strength" OR innerstrength
"inner strength" OR innerstrength kanji
perseverance kanji
nintai
nin tai
Kokoro ga tsuyoi
Kennin-fubatsu
chikara
  
In Google web search:
chikara kanji
chikara strength kanji
Kokoro ga tsuyoi
"inner strength" kanji