jQuery, Array IndexOf function and FadeIn and FadeOut!

if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(elt /*, from*/)
{
var len = this.length;

var from = Number(arguments[1]) || 0;
from = (from < 0) ? Math.ceil(from) : Math.floor(from);
if (from < 0)
from += len;

for (; from < len; from++)
{
if (from in this &&
this[from] === elt)
return from;
}
return -1;
};
}

jQuery.fn.fadeIn = function()
{
this.show();
}

jQuery.fn.fadeOut = function()
{
this.hide();
}
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