Remove object from a JavaScript Array?

Possible Duplicate:
Remove specific element from a javascript array?

Specifically I have an array as follows:

var arr = [
    {url: 'link 1'},

    {url: 'link 2'},
    {url: 'link 3'}
];

Now you want to remove valuable element url "link 2" and after removing the only arrays as follows:

arr = [
    {url: 'link 1'},
    {url: 'link 3'}

];

So who can help me this problem? Thanks a lot