var is_chrome = /chrome/.test( navigator.userAgent.toLowerCase() );
var is_safari = /safari/.test( navigator.userAgent.toLowerCase() );
var myvar = 0;
var myexit = 0;

if(is_chrome == true || is_safari == true) {
	YUI().use('history', function (Y) {
		var history = new Y.History({
			initialState: {kittens: null,}
  		});
  		
  		history.addValue('kittens');
  		
  		Y.on('history:change', function (e) {
  		if (myvar == 1){
  			myexit=1;
      		window.location ='/FREEbook';
      		}
      	myvar=myvar + 1;
      	});	
});
}
else{
YUI().use('history', function (Y) {
		var history = new Y.History({
			initialState: {kittens: 'cat',}
  		});
  		
  		Y.on('history:change', function (e) {
      		myexit=1;
      		window.location ='/FREEbook';
      	});	
});
}