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

function clearCookie(c_name,value,expiredays) {
  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 (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 checkCookie( field ) {
  username=getCookie('username');
  if (username!=null && username!="") {
    document.getElementById(field).value=username;
    setCookie('username',username,1460);
  }
}

function checkCookieCheckbox( field ) {
  username=getCookie('username');
  if (username!=null && username!="") {
    document.getElementById(field).checked=true;
    setCookie('username',username,1460);
  }
}