Doubt about prototype and constructor properties

Hi,

Recently I started working with the prototype property of functions, and running the following code I found a problem

[CODE]function p(param) {
this.y = param;
}

function f(param) {
this.x = param;
}

f.prototype = new p(2);
var obj = new f(1);

alert(f.prototype.constructor);
alert(obj.constructor);[/CODE]

I don´t know why a get the same result in both alerts. I mean, the second one tells me the obj constructor is p, instead of f, as I suppose it should be. Does anyone know why?

Thanks in advance.

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