Words In A String

Let's say I have the following var:

Code:

strTemp="Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed"

and I am searching the string for another string 'amet', for example. How would I go about getting my page to output the word I search for and say 10 chars to the left and 10 to the right? So, in this case, I'd like to be be able to search the string with any
other string ['amet' for example] and have it output this:

Code:

...dolor sit amet, consecte...