//alert( 'child '+ document.domain );
document.domain=documentDomainSuffix(document.domain);

function documentDomainSuffix( myDomain ){
  var lastPoint = myDomain.lastIndexOf(".");
  if( lastPoint == -1 ){
    return myDomain;
  }
  var firstPoint = myDomain.indexOf( "." );
  if( firstPoint == lastPoint )
  {
    return myDomain;
  }
  
  var cutPoint = myDomain.substr(0, lastPoint).lastIndexOf(".");
 
  if (myDomain.substr(cutPoint+1, myDomain.length-cutPoint ) == 'co.uk'){
  cutPoint = firstPoint;
  }
  return myDomain.substr(cutPoint+1, myDomain.length-cutPoint );
}