//kiem tra browser cho dung cookie khong
function checkBrowserEnableCookie(){
	var cookieEnabled=(navigator.cookieEnabled)? true : false
	
	//if not IE4+ nor NS6+
	if (typeof navigator.cookieEnabled=="undefined" && !cookieEnabled){ 
		document.cookie="testcookie"
		cookieEnabled=(document.cookie.indexOf("testcookie")!=-1)? true : false
	}
	
	if (cookieEnabled) return true;
	else return false;
}

//tao cookie
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=/";
}

//doc cookie
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 "";
}

//xoa bo cookie
function eraseCookie(name) {
	createCookie(name,"",-1);
}


function emptyShoppingCart(name) {
	createCookie(name,'-',1);
}