function _uGC(l,n,s) {
  if (!l || l=="" || !n || n=="" || !s || s=="") return "-";
  var i,i2,i3,c="-";
  i=l.indexOf(n);
  i3=n.indexOf("=")+1;
  if (i > -1) {
    i2=l.indexOf(s,i); if (i2 < 0) { i2=l.length; }
    c=l.substring((i+i3),i2);
  }
  return c;
}

// 
// Get the __utmz cookie value. This is the cookies that 
// stores all campaign information. 
// 
var z = _uGC(document.cookie, '__utmz=', ';'); 
// 
// The cookie has a number of name-value pairs. 
// Each identifies an aspect of the campaign. 
// 
// utmcsr  = campaign source 
// utmcmd  = campaign medium 
// utmctr  = campaign term (keyword) 
// utmcct  = campaign content (used for A/B testing) 
// utmccn  = campaign name 
// utmgclid = unique identifier used when AdWords auto tagging is enabled 
// 
// This is very basic code. It separates the campaign-tracking cookie 
// and populates a variable with each piece of campaign info. 
// 
var source  = _uGC(z, 'utmcsr=', '|'); 
var medium  = _uGC(z, 'utmcmd=', '|'); 
var term    = _uGC(z, 'utmctr=', '|'); 
var content = _uGC(z, 'utmcct=', '|'); 
var campaign = _uGC(z, 'utmccn=', '|'); 
var gclid   = _uGC(z, 'utmgclid=', '|'); 
// 
// The gclid is ONLY present when auto tagging has been enabled. 
// All other variables, except the term variable, will be '(not set)'. 
// Because the gclid is only present for Google AdWords we can 
// populate some other variables that would normally 
// be left blank. 
// 
if (gclid !="-") { 
      source = 'google'; 
      medium = 'cpc'; 
} 

// Below is the populate function.  
function populateHiddenFields(f) { 
  f.websource.value = source;    // Web source
  f.webmedium.value = medium;    // Web medium
  f.webkeyword.value = term;      // Web keyword
  f.webcontent.value = content;   // Web content
  f.webcampaign.value = campaign;  // Web campaign

  return true; 
}