var TimerCookie = {

	createCookie: function(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=/";
	},
	
	readCookie: function(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;
	},
	
	eraseCookie: function(name){
		TimerCookie.createCookie(name, "", -1);
	}
	
}




var Overlay = {
	timer_cont:null,
	cancel:null,

	init: function(){
		Overlay.initHtmlElements();
	},

	initHtmlElements: function(){
		
		if (!TimerCookie.readCookie('proBBPiciana')){
		
			Overlay.timer_cont = document.getElementById('timer_container');
			Overlay.cancel = document.getElementById('cancelIntro');
			
			Overlay.timer_cont.style.height=Overlay.findHeight() + "px";
			
			Overlay.changeOpacity(0.9);

			Overlay.cancel.onclick = Overlay.quitIntro;
		}
	},
	
	quitIntro :function() {
		TimerCookie.createCookie('proBBPiciana',true,1);
		Overlay.fadeOut(0.9);
	},
	
	findHeight: function(){

		var	scnHei = document.body.clientHeight;
		return(scnHei);
	},
	
	changeOpacity : function(alpha){
			
			Overlay.timer_cont.style.display="block";
			Overlay.timer_cont.style.opacity = alpha;
			Overlay.timer_cont.style.filter  = "alpha(opacity=" + alpha*100 + ")";
	},
	
	fadeOut : function(alpha){

		Overlay.timer_cont.style.opacity = alpha;
		Overlay.timer_cont.style.filter  = "alpha(opacity=" + alpha*100 + ")";
		
		alpha=alpha-0.2;

		if(alpha>0){
			setTimeout('Overlay.fadeOut('+alpha+')',100);
		}
		else {
			Overlay.timer_cont.style.display="none";
		}

	}
	
};