var cookieString = new String(document.cookie);
var cookieHeader = 'click0' ;
var Then = new Date();
Then.setTime(Then.getTime() + 30*60*1000 );
var beginPosition = cookieString.indexOf(cookieHeader);

if (beginPosition == -1)
   {
   
   document.cookie = "Cookieak=click0;expires="+ Then.toGMTString() +";path=/";
   }