common javascript functions

//trim
function trim(str){
str = str.replace(/(^\s*)|(\s*$)/g,"");
return str;
}

//write cookie
function writeCookie(cookieName, cookieValue, cookiePath, expireMilliseconds){
  var todayDate = new Date();
  var expireSetting = "";
  if(expireMilliseconds != 0){
    todayDate.setTime(todayDate.getTime() + expireMilliseconds);
    expireSetting = "expires=" + todayDate.toGMTString() + ";";
  }
  var pathSetting = "";
  if(cookiePath != ""){
    pathSetting = "path=" + cookiePath + ";";
  }
  document.cookie = cookieName + "=" + cookieValue + ";" + pathSetting + expireSetting;
}

//read cookie
function readCookie(cookieName){
  var cookieArray = document.cookie.split(";");
  for(var i = 0 ; i < cookieArray.length ; i++){
    var nameAndValue = cookieArray[i].split("=");
    if(trim(nameAndValue[0]) == cookieName && nameAndValue.length == 2){
      return trim(nameAndValue[1]);
    }
  }
  return "";
}

//delete cookie
function deleteCookie(cookieName, cookiePath){
  writeCookie(cookieName, "", cookiePath, -1 * 24 * 60 * 60 * 1000);
}

//get key code according to browser
function getKeyCode(eventToGetKeyCode){
  var keyCodeFromEvent;
  if(window.event){ // IE
    keyCodeFromEvent = eventToGetKeyCode.keyCode;
  }else if(eventToGetKeyCode.which) { // Netscape/Firefox/Opera
    keyCodeFromEvent = eventToGetKeyCode.which;
  }
  return keyCodeFromEvent;
}


//event-adding function for cross browser
function addEventHandler(obj, eventName, handler){
if(document.attachEvent){
obj.attachEvent("on" + eventName, handler);
}else if(document.addEventListener){
obj.addEventListener(eventName, handler, false);
}
}

//event-removing function for cross browser
function removeEventHandler(obj, eventName, handler){
if(document.detachEvent){
obj.detachEvent("on" + eventName, handler);
}else if(document.removeEventListener){
obj.removeEventListener(eventName, handler, false);
}
}

//get active object function for cross browser
function getActivatedObject(e){
var obj;
if(!e){
obj = window.event.srcElement; //old explorer
}else if(e.srcElement){
obj = e.srcElement; //ie7 or later
}else{
obj = e.target; //dom level 2
}
return obj;
}

//clear child nodes
function clearChildNodes(nodeToClear){
  for(var i = nodeToClear.childNodes.length; i > 0 ; i--){
    nodeToClear.removeChild(nodeToClear.childNodes[i - 1]);
  }
}

//set inner text
function setInnerText(nodeToSet, textToSet){
  clearChildNodes(nodeToSet);
  //var textArray = textToSet.toString().split("<br>");
  var textArray = textToSet.toString().split(/<br>/i);
  for(i = 0 ; i < textArray.length ; i++){
  if(i > 0){ nodeToSet.appendChild(document.createElement("br")); }
    var newTextNode = document.createTextNode(textArray[i]);
    nodeToSet.appendChild(newTextNode);
  }
}