function setCookie(c_name,value,expiredays) {
	if (navigator.cookieEnabled) {
		var exdate = new Date();
		exdate.setDate(exdate.getDate()+expiredays);
		document.cookie = c_name+ "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
	}
}

function getCookie(c_name) {
	if (navigator.cookieEnabled) {
		if (document.cookie.length>0) {
			c_start=document.cookie.indexOf(c_name + "=");
			if (c_start!=-1) {
				c_start = c_start + c_name.length+1;
				c_end   = document.cookie.indexOf(";",c_start);
				if (c_end==-1) c_end=document.cookie.length;
				return unescape(document.cookie.substring(c_start,c_end));
			}
		}
	}
	return "";
}

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

function checkCookie(c_name) {
	val = getCookie(c_name);
	if (val!=null && val!="") {
		return val;
	} else {
		//do something here if cookie doesn't exist.
	}
}