JavaScript to show all elements of a specified class.

ShowAllEditClassElements.js

function changeDisplayAll(className, state) {
  var editXPath = "//*[@class='" + className + "']";
  var editElements = new Array();
  var editElementsCount = 0;

  var editXPResult = document.evaluate(editXPath, document, null, XPathResult.ANY_TYPE, null);
  var thisEditClass = editXPResult.iterateNext();

  while (thisEditClass) {
    editElements[editElementsCount++] = thisEditClass
    thisEditClass = editXPResult.iterateNext();
  }

  for (var i=0; i < editElementsCount; i++) {
    editElements[i].style.display = state;
  }
}