addEvent (window, "load", setUp, false);

function addEvent(object, evName, fnName, cap) {
   if (object.attachEvent)
       object.attachEvent("on" + evName, fnName); (Solution.....because of this "on".....)
   else if (object.addEventListener)
       object.addEventListener(evName, fnName, cap);
}
function setUp() {
    var transDoc = document.getElementById("doc");
	var olElem = document.createElement("ol");
		for (var i = 0; i < french.length; i++){
	var newLI = document.createElement("li");
		newLI.innerHTML = french[i];
		newLI.id = i + "phrase"; 
		newLI.style.cursor = "pointer";
		addEvent(newLI, "onmousedown", swapFE, false); (Solution-change these to exclude on.)
		addEvent(newLI, "onmouseup", swapEF, false);  <--------("mousedown" & "mouseup")-----------
		olElem.appendChild (newLI);
		}
		transDoc.appendChild(olElem);
 }
function swapFE(e) {
	var phrase = event.target || event.srcElement;
		if (phrase.nodeName == "#text")
		phrase = phrase.parentNode;
		
	var phraseNum = parseInt(phrase.id);
		phrase.innerHTML = english[phraseNum];
		phrase.style.color = "rgb(155,102,102)";
		phrase.style.fontstyle = "italic";
}
function swapEF(e) {
	var phrase = event.target || event.srcElement;
		if (phrase.nodeName == "#text")
		phrase = phrase.parentNode;
 
	var phraseNum = parseInt(phrase.id);
		phrase.innerHTML = french[phraseNum];
		phrase.style.color = "rgb(0,0,0)";
		phrase.style.fontstyle = "normal";
}

 <div id = "doc">
         <h1>Week 5 Phrases</h1>
         <h2>Press down your mouse button on each phrase to translate</h2>

      </div>
      <address>
         French-English Translation Page
      </address>
   </div>