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Add values of a column

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I have some columns generated dynamically based on the rows of data. If I wanted to add all the values of a particular column (say column3 has 20 rows with values ranging from 1-20)and display them on my page, how do I go about it using JSP/Javascript? Also how do I limit the number of rows displayed in a page to say 10 and subsequent rows should be divided into rows of 10? User clicks a button like "previous" or "next" to reach the previous or next 10 rows.
Thanks in advance
A neophyte
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