//http://www.aiim.org/js-cookies-test.htm
	
	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 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";
	  }
	}
	
	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" : "" );
	}
	
	/*
	 *   Helper function for GetCookie()
	 */
	function getCookieVal( offset ) {
	  var endstr = document.cookie.indexOf ( ";", offset );
	  if ( endstr == -1 ) endstr = document.cookie.length;
	  return unescape( document.cookie.substring( offset, endstr ) );
	}

  	SetCookie( "foo", "bar" );
  	if (GetCookie( "foo" )) 
  	{
    	DeleteCookie( "foo" );
  	} 
  	else 
  	{
		alert("This site requires cookies to work properly, please see our help section for instructions on enabling cookies");	 
  	}