Array length in Javascript chrome error -

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i have strange problem js console in chrome, if go in chrome console , write :

var numero = new array(["/php/.svn/tmp", "/php/.svn/props"]);

return me "undefined" think numero array 2 elements, if write:

numero

returns:

[array[2]]

after 

numero.length

and return 1 ..... why? don't return 2 ??? doing wrong? can give method returns 2? in advance

edit: explain problem. have function return when selected 2 items :

myfolders.getselected() ["/php/.svn", "/php/upload.php"]

and when selected 1 items:

myfolders.getselected() "/php/upload.php"

as u note second 1 isn't array.

now use method activate on change selected item calculate global variable:

function calcolonumeroelementi(){     var numero = new array(myfolders.getselected());     numeroelementiselezionati = numero[0].length; }

but returns 1 or number of characters when selected 1 items.

don't use new array, use literal notation:

var numero = ["/php/.svn/tmp", "/php/.svn/props"];

update (based on comments)

if have function myfolders.getselected() returns single string , want add array, can either declaratively:

var numero = [myfolders.getselected()]

or, if plan add multiple values, e.g. in loop, can push new value array

var numero = []; ... numero.push(myfolders.getselected());

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