When I try to debug my javascript with explorer ever jumps this issue and then I can't check my javascript. It also did susccess with 1.6.3 but I thought it has solved. I believe it's a problem of jquery, this are the error that appear:

SCRIPT5007: No se puede obtener valor de la propiedad 'length': el objeto es nulo o está sin definir

jquery-1.6.4.min.js, Línea 3 Carácter 15137

SCRIPT5007: No se puede obtener valor de la propiedad 'length': el objeto es nulo o está sin definir

jquery-1.6.4.min.js, Línea 3 Carácter 15137

this is what fails: h = a.length

this is all the line of the code: a.nodeName.toUpperCase() === b.toUpperCase() }, each: function (a, c, d) { var f, g = 0, h = a.length, i = h === b || e.isFunction(a); if (d) { if (i) { for (f in a) if (c.apply(a[f], d) === !1) break } else for (; g < h; ) if (c.apply(a[g++], d) === !1) break } else if (i) { for (f in a) if (c.call(a[f], f, a[f]) === !1) break } else for (; g < h; ) if (c.call(a[g], g, a[g++]) === !1) break; return a }, trim: H ? function (a) { return a == null ? "" : H.call(a) } : function (a) { return a == null ? "" : (a + "").replace(k, "").replace(l, "") }, makeArray: function (a, b) { var c = b || []; if (a != null) { var d = e.type(a); a.length == null || d === "string" || d === "function" || d === "regexp" || e.isWindow(a) ? F.call(c, a) : e.merge(c, a) } return c }, inArray: function (a, b) { if (!b) return -1; if (I) return I.call(b, a); for (var c = 0, d = b.length; c < d; c++) if (b[c] === a) return c; return -1 }, merge: function (a, c) { var d = a.length, e = 0; if (typeof c.length == "number") for (var f = c.length; e < f; e++) a[d++] = c[e]; else while (c[e] !== b) a[d++] = c[e++]; a.length = d; return a }, grep: function (a, b, c) { var d = [], e; c = !!c; for (var f = 0, g = a.length; f < g; f++) e = !!b(a[f], f), c !== e && d.push(a[f]); return d }, map: function (a, c, d) { var f, g, h = [], i = 0, j = a.length, k = a instanceof e || j !== b &&