function saveCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000))
		var expires = "; expires="+date.toGMTString()
	}
	else expires = ""
	document.cookie = name+"="+value+expires+"; path=/"
}
function readCookie(name) {
	testCookies()
	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
}
function deleteCookie(name){saveCookie(name,"",-1)}
function testCookies(){
	var ca = document.cookie.split(';')
	for(var i=0;i<ca.length;i++) {var c = ca[i];
		if(c.indexOf("expires") !=-1){deleteCookie(c.substring(0,c.indexOf("=")))}
	}
}