// Exact Target Client Side Functions (JavaScript Document)
// June 24th 2004
// Author: Emil Anticevic; emila@estco.net
// ESTCO Medical LLC


// Cross Browser Compatible Cookie Fetch Function
// @Param name - the name of the cookie that has been set by this domain
function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}
//
//  Function to correct for 2.x Mac date bug.  Call this function to
//  fix a date object prior to passing it to SetCookie.
//  IMPORTANT:  This function should only be called *once* for
//  any given date object!  See example at the end of this document.
//
function FixCookieDate (date) {
  var base = new Date(0);
  var skew = base.getTime(); // dawn of (Unix) time - should be 0
  if (skew > 0)  // Except on the Mac - ahead of its time
    date.setTime (date.getTime() - skew);
}
//
//  Function to return the value of the cookie specified by "name".
//    name - String object containing the cookie name.
//    returns - String object containing the cookie value, or null if
//      the cookie does not exist.
//
function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
      return getCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break; 
  }
  return null;
}
//
//  Function to create or update a cookie.
//    name - String object containing the cookie name.
//    value - String object containing the cookie value.  May contain
//      any valid string characters.
//    [expires] - Date object containing the expiration data of the cookie.  If
//      omitted or null, expires the cookie at the end of the current session.
//    [path] - String object indicating the path for which the cookie is valid.
//      If omitted or null, uses the path of the calling document.
//    [domain] - String object indicating the domain for which the cookie is
//      valid.  If omitted or null, uses the domain of the calling document.
//    [secure] - Boolean (true/false) value indicating whether cookie transmission
//      requires a secure channel (HTTPS).  
//
//  The first two parameters are required.  The others, if supplied, must
//  be passed in the order listed above.  To omit an unused optional field,
//  use null as a place holder.  For example, to call SetCookie using name,
//  value and path, you would code:
//
//      SetCookie ("myCookieName", "myCookieValue", null, "/");
//
//  Note that trailing omitted parameters do not require a placeholder.
//
//  To set a secure cookie for path "/myPath", that expires after the
//  current session, you might code:
//
//      SetCookie (myCookieVar, cookieValueVar, null, "/myPath", null, true);
//
function SetCookie (name,value,expires,path,domain,secure) {
  document.cookie = name + "=" + escape (value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

//  Function to delete a cookie. (Sets expiration date to start of epoch)
//    name -   String object containing the cookie name
//    path -   String object containing the path of the cookie to delete.  This MUST
//             be the same as the path used to create the cookie, or null/omitted if
//             no path was specified when creating the cookie.
//    domain - String object containing the domain of the cookie to delete.  This MUST
//             be the same as the domain used to create the cookie, or null/omitted if
//             no domain was specified when creating the cookie.
//
function DeleteCookie (name,path,domain) {
  if (GetCookie(name)) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

// This Function outputs an invisible image to the end of the document that sends the data
// to the ExactTarget account
// @Param cLinkId - conversion_link_id
// @Param linkAlias - link_alias (Page title)
// @Param displayOrder - display_order
// @Param - dataSetXml Example: '<data amt="100" unit="Dollars" accumulate="true">'
function loadExactTarget(cLinkId, linkAlias, displayOrder, dataSetXml)
{
	var imageNode = document.createElement("IMG");
	var jobId = GetCookie("JobId");
	var emailAddress = GetCookie("EmailAddr");
	var listId = GetCookie("ListID");
	var urlId = GetCookie("UrlID");
	if (jobId != null && emailAddress != null && listId != null && urlId != null)
	{
		var xml = "<system>";
		xml += "<system_name>tracking</system_name>";
		xml += "<action>conversion</action>";
		xml += "<job_id>"+jobId+"</job_id>";
		xml += "<email>"+emailAddress+"</email>";
		xml += "<list>"+listId+"</list>";
		xml += "<original_link_id>"+urlId+"</original_link_id>";
		xml += "<conversion_link_id>"+cLinkId+"</conversion_link_id>";
		xml += "<link_alias>"+linkAlias+"</link_alias>";
		xml += "<display_order>"+displayOrder+"</display_order>";
		xml += "<data_set>"+dataSetXml+"</data_set>";
		xml += "</system>";
		document.body.appendChild(imageNode);
		imageNode.width = 1;
		imageNode.height = 1;
		imageNode.src = "http://click.exacttarget.com/conversion.aspx?xml="+xml+"&seed="+Math.random();
	}
}