Soporte "call" y "apply" para navegadores antiguos

Call:

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//------------------------------------------------------------------------------------------------ // Engines      JavaScript 1.1+ //              JScript    2+ // Environments NN3+ IE4+ MOZILLA1+ SAFARI1+ //------------------------------------------------------------------------------------------------ function __fn_call (o /* object, arg1 [, ... [, argN]] */) {     var a = arguments;     var s = '';     var u;       for (var i = 1, l = a.length, n = l - 1; i < l; ++i)     {         s += 'a[' + i + ']';             if (i < n)             s+= ',';     }        if (o == null)         s = eval('this(' + s + ')');         else     {         o.__callback = this;         s = eval('o.__callback(' + s + ')');         o.__callback = u;     }        return s; }   //------------------------------------------------------------------------------------------------   if (!Function.prototype.call) Function.prototype.call = __fn_call;

Apply:

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//------------------------------------------------------------------------------------------------ // Engines      JavaScript 1.1+ //              JScript    2+ // Environments NN3+ IE4+ MOZILLA1+ SAFARI1+ //------------------------------------------------------------------------------------------------ function __fn_apply (o /* object */, a /* [args] */ ) {     var u, s = '';     if (a && a.constructor == Array) for (var i = 0, l = a.length, n = l - 1; i < l; ++i)     {         s += 'a[' + i + ']';             if (i < n)             s+= ',';     }        if (o == null)         s = eval('this(' + s + ')');         else     {         o.__callback = this;         s = eval('o.__callback(' + s + ')');         o.__callback = u;     }        return s; }   //------------------------------------------------------------------------------------------------   if (!Function.prototype.apply) Function.prototype.apply = __fn_apply;