function getCookie(c_name) {
	var nameEQ = c_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 setCookie(c_name,value,expiredays) {
	if (expiredays) {
		var date = new Date();
		date.setTime(date.getTime()+(expiredays*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = c_name+"="+value+expires+"; path=/";
}

/*function checkCookie() {
	username=getCookie('username');
	if (username!=null && username!="") {
		alert('Welcome again '+username+'!');
	} else {
		username=prompt('Please enter your name:',"");
		if (username!=null && username!="") { setCookie('username',username,365); }
	}
}*/

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