function setCookie(c_name, c_value, expiredays) {
  var expiredate=new Date();
  expiredate.setDate(expiredate.getDate() + expiredays);
  document.cookie = c_name + "=" + escape(c_value) + ((expiredays==null) ? "" : ";expires=" + expiredate.toGMTString())
}


function getCookie(c_name) {
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);
}