Summing column values in sortable dataset

Question

http://cccw.ecologik.net/admin/lookup/
Simple page that has a reapting region that is sortable. You notice at the bottom of the table I have a "Total Saved." I would like this to be able to sum up the pSaved column. I know I could get this dynamically when I first create the table in php but once the user sorts, how can I recount the pSaved column? I would think this is a common request but can't seem to find anything about it out there!
Thanks for any help in advance.
Jon

Answer 1

Thanks for the response. After a bit of digging I came up with a solution myself.
I simply added decided to sum the fields as they went through the filterFunc()
if (!document.getElementById("containsCB").checked)
    regExpStr = "^" + regExpStr;
    sumOfFields=0
    var regExp = new RegExp(regExpStr, "i");
    var filterFunc = function(ds, row, rowNumber){
       var columnNames = ["Last","First","email","watershed","pledge","City"],
       result = false;
         for( var i = 0; i < columnNames.length; i++ ){
                    // search for a match
               if( row[ columnNames[i] ] && row[ columnNames[i] ].search( regExp ) != - 1 ){
                    result = true;
                    sumOfFields=sumOfFields + Number(row["pSaved"])
                    break; // stop looping.
on the table page itself I added small piece of code.
<script type="text/javascript">
          document.getElementById("resultsArea").innerHTML=sumOfFields;
</script>
Works like a charm! Thanks again for the input!