function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}


function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}


function eraseCookie(name) {
	createCookie(name,"",-1);
}


function checkEgg(elemName) {
   //alert(elemName);
   var x = readCookie(elemName);
   var d = document.getElementById(elemName)

   //alert('d is ' + d);
   if (x)
      {
      //cookie already exists, so do not display
      //alert('have x');
      d.style.visibility="hidden";
      return;
      }

   //cookie doesn't exist, so decide whether or not to display the egg

   var y = readCookie('numPages');
   var yi;

   if (y)
      {
      yi = parseInt(y);
      if (yi<5)
         {
         //alert('not yet 5');
         yi++;
         createCookie('numPages',yi.toString());
         d.style.visibility="hidden";
         return;
         }
      else
         {
         yi++;
         createCookie('numPages',yi.toString());
         }
      }
   else
      {
      //alert('1st page');
      yi = 1;
      createCookie('numPages',yi.toString());
      d.style.visibility="hidden";
      return;
      }

   //we are here, which means there has been at least 5 pages viewed in this session.
   var r = Math.round(Math.random()*8);
   //alert('r is ' + r);
   if ((r==3) || (r==6) || (yi>11))
      {
      d.style.visibility="visible";
      }
   else
      {
      d.style.visibility="hidden";
      }
}


function setEgg(elemName)
{
   createCookie(elemName,'1',50);
}