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function getCookie(name)
  {
    var re = new RegExp(name + "=([^;]+)");
    var value = re.exec(document.cookie);
    return (value != null) ? unescape(value[1]) : null;
  }
  
document.write(getCookie("field1"));



//////////


function crearCookie(clave, valor, diasexpiracion) {
    var d = new Date();
    d.setTime(d.getTime() + (diasexpiracion*24*60*60*1000));
    var expires = "expires="+d.toUTCString();
    document.cookie = clave + "=" + valor + "; " + expires;
}

function obtenerCookie(clave) {
    var name = clave + "=";
    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);
        if (c.indexOf(name) == 0) return c.substring(name.length,c.length);
    }
    return "";
}

function comprobarCookie(clave) {
    var clave = obtenerCookie(clave);
    if (clave!="") {
        // La cookie existe.
    }else{
        // La cookie no existe.
    }
}