Proper Case all values in a colum

titleCaseColumn.js

// Google Apps Script
// relies on titleCaps(): http://ejohn.org/blog/title-capitalization-in-javascript/

function titleCaseColumn() {
  var columnNum = 5;

  ss = SpreadsheetApp.getActiveSheet();
  
  for(var i = 2; i < ss.getLastRow(); i++) {
    var proper = titleCaps(ss.getRange(i, columnNum).getValue().toLowerCase());
    ss.getRange(i, columnNum).setValue(proper);
  }
  SpreadsheetApp.flush();
}