JavaScript - Please Refresh My Memory.

<script type="text/javascript">
function loadQuickMessageCheck(File,ID){

var xmlhttp; 

if (window.XMLHttpRequest)  {
  xmlhttp=new XMLHttpRequest();
  }
else {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }

xmlhttp.onreadystatechange=function(){
  if (xmlhttp.readyState==4 && xmlhttp.status==200){
    document.getElementById(ID).innerHTML=xmlhttp.responseText;
	 eucalyptus = setInterval(function(){loadQuickMessageCheck(File,ID)},20000);
    }
  }

xmlhttp.open("POST",File,true);
xmlhttp.send();
}
</script>

        for (i=0; i<pm_length; i++) {  
            var content = data.pm[i].content;
            var mood = data.pm[i].mood;
            var time_added = data.pm[i].time_added; 
            var fb_id = data.pm[i].user_id;
            var msg_id = data.pm[i].id;  
            var user_status = data.pm[i].user_status; 
            var full_name = data.pm[i].first_name + " " + data.pm[i].last_name; 
            if($("#pm"+fb_id).length == 0) {
            var closetab = '<a class="close">x</a>'+full_name;
                $(".tabs").append('<li class="bot_room" id="pm'+fb_id+'" type="pm" tab="#tabpm'+fb_id+'">'+closetab+'</li>');
                $(".tab_container").append('<div id="tabpm'+fb_id+'"  class="tab_content" style="display: none;"></div>');
            }
            create_message('pm'+fb_id, msg_id, fb_id, full_name, content, 'no', user_status, time_added, mood); 
            if($("#pm_alert").attr('checked')) {
                soundManager.onready(function(){
                    var mySound = soundManager.createSound({
                     id:'mySound1',
                     url:'images/new_msg.mp3'
                    });
                    mySound.play(); 
                    mySound = null; 
  
                }); 
            } 
            content = null;  
            mood = null;  
            time_added = null;  
            fb_id = null;  
            msg_id = null;   
            user_status = null;   
            full_name = null;   
        }

var selected = 0;    
var choiceOne;    
var choiceTwo;   
var matches = 0;     
var numOfTries = 0;
var interval = 700;
var gamePlace = document.getElementById("wrap");
var backcard="img/memoryBg.png";
var timeStart;
var timeFinish;
var time;
                            
function nameEnter(){
    var name = prompt("Please enter your name");
    if (name != null){
        document.title =
        "Welcome " + name + "!";
        }
            }
			
function game(){
var nOfPairs = document.getElementById("nPairs").value;

timeStart = new Date().getTime();

if (nOfPairs==1){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
}	
if (nOfPairs==2){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
cards.sort(function shuffle(){
   return Math.random() - 0.5;});
}
if (nOfPairs==3){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
    cards[4] = 'img/card3.png';
    cards[5] = 'img/card3.png';
cards.sort(function shuffle(){
   return Math.random() - 0.5;});
}
if (nOfPairs==4){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
    cards[4] = 'img/card3.png';
    cards[5] = 'img/card3.png';
    cards[6] = 'img/card4.png';
    cards[7] = 'img/card4.png';
	
cards.sort(function shuffle(){
   return Math.random() - 0.5;});
}
if (nOfPairs==5){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
    cards[4] = 'img/card3.png';
    cards[5] = 'img/card3.png';
    cards[6] = 'img/card4.png';
    cards[7] = 'img/card4.png';
    cards[8] = 'img/card5.png';
    cards[9] = 'img/card5.png';
    cards.sort(function shuffle(){
   return Math.random() - 0.5;});
}
if (nOfPairs==6){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
    cards[4] = 'img/card3.png';
    cards[5] = 'img/card3.png';
    cards[6] = 'img/card4.png';
    cards[7] = 'img/card4.png';
    cards[8] = 'img/card5.png';
    cards[9] = 'img/card5.png';
    cards[10] = 'img/card6.png';
    cards[11] = 'img/card6.png';
    cards.sort(function shuffle() {
   return Math.random() - 0.5;});
}
if (nOfPairs==7){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
    cards[4] = 'img/card3.png';
    cards[5] = 'img/card3.png';
    cards[6] = 'img/card4.png';
    cards[7] = 'img/card4.png';
    cards[8] = 'img/card5.png';
    cards[9] = 'img/card5.png';
    cards[10] = 'img/card6.png';
    cards[11] = 'img/card6.png';
    cards[12] = 'img/card7.png';
    cards[13] = 'img/card7.png';
cards.sort(function shuffle(){
   return Math.random() - 0.5;});
}
if (nOfPairs==8){
var cards=[];
    cards[0] = 'img/card1.png';
    cards[1] = 'img/card1.png';
    cards[2] = 'img/card2.png';
    cards[3] = 'img/card2.png';
    cards[4] = 'img/card3.png';
    cards[5] = 'img/card3.png';
    cards[6] = 'img/card4.png';
    cards[7] = 'img/card4.png';
    cards[8] = 'img/card5.png';
    cards[9] = 'img/card5.png';
    cards[10] = 'img/card6.png';
    cards[11] = 'img/card6.png';
    cards[12] = 'img/card7.png';
    cards[13] = 'img/card7.png';
    cards[14] = 'img/card8.png';
    cards[15] = 'img/card8.png';
cards.sort(function shuffle(){
   return Math.random() - 0.5;});
}
                
if(nOfPairs>8||nOfPairs<1){
    alert("Please enter the number from 1 to 8");
    }else{
		for(i = 0; i<=nOfPairs*2-1; i++){
            var cardDiv = document.createElement("div");
                cardDiv.setAttribute("id",""+i+"");
                cardDiv.style.height="65px";
                cardDiv.style.width="65px";
                cardDiv.style.float='left';
                gamePlace.appendChild(cardDiv);
                document.getElementById(""+i+"").innerHTML='<img src="img/memoryBg.png">';
								
                cardDiv.onclick=function(){cardClick(this.id);}; 
                    }
            }
                
function cardClick(card){
 
    if (selected==2){   
        return ;
    }
   
    if (selected==0){   
        choiceOne=card;
        document.images[card].src = cards[card];
        selected = 1; 
    }else { 
        selected = 2;
        choiceTwo = card;
        document.images[card].src =cards[card];
        var timer=setInterval(checking,interval); 
    }
    function checking()
{
    clearInterval(timer);
    numOfTries++;
    document.getElementById("tries").innerHTML = numOfTries;
    
    if (cards[choiceTwo]==cards[choiceOne]){   
        matches++;
        document.images[choiceOne].src = "img/memoryBgI.png";
        document.images[choiceTwo].src = "img/memoryBgI.png";
        //choiceTwo.onclick=null;
    } else { 
        document.images[choiceOne].src = "img/memoryBg.png";
        document.images[choiceTwo].src = "img/memoryBg.png";
        selected = 0;
        return ;
    }
	if (matches == nOfPairs){ 
		  timeFinish = new Date().getTime();
		  time = Math.round (((timeFinish - timeStart)/1000));
          alert("Congrats! You needed " + numOfTries + " tries, and " + time + " seconds.");
        }
        selected = 0;
        return ;
}
}
            }

function go() {
      
      // create giant text string in variable 'bill' then set 'bill' to null - store inside variable called 'test' as text.
      var test = "bill = 'blah blah blah blah blah (repeat blah about a thousand times or so for file size)'; bill = null;";
      
      // execute text inside variable 'test' as code
      var tester = new Function(test);
      
      // destroy function used to execute string as code
      tester = null;
      
    }