var people, asc1 = 1,
        asc2 = 1,
        asc3 = 1;
    window.onload = function () {
        people = document.getElementById("people");
    }

    function sort_table(tbody, col, asc)
{
var rows = tbody.rows;
var rlen = rows.length;
var arr = new Array();
var i, j, cells, clen;
// fill the array with values from the table
for(i = 0; i < rlen; i++)
{
    cells = rows[i].cells;
    clen = cells.length;
    arr[i] = new Array();
  for(j = 0; j < clen; j++) { arr[i][j] = cells[j].innerHTML; }
}
// sort the array by the specified column number (col) and order (asc)
arr.sort(function(a, b)
{
    var retval=0;
    var fA=parseFloat(a[col]);
    var fB=parseFloat(b[col]);
    if(a[col] != b[col])
    {
        if((fA==a[col]) && (fB==b[col]) ){ retval=( fA > fB ) ? asc :
-1*asc; } //numerical
        else { retval=(a[col] > b[col]) ? asc : -1*asc;}
    }
    return retval;
});
for(var rowidx=0;rowidx<rlen;rowidx++)
{
    for(var colidx=0;colidx<arr[rowidx].length;colidx++){
tbody.rows[rowidx].cells[colidx].innerHTML=arr[rowidx][colidx]; }
}
}