delete all posts shown in tumblr dashboard

$x('//ol[@id="posts"]/li[@id]').map ( function (n) {
    var id = $x('.//form//input[@name="id"]/@value', n).pop().nodeValue;
    var k = $x('.//form//input[@name="form_key"]/@value', n).pop().nodeValue;
    
var q =   "id=" + id + "&form_key=" + k;
with( new XMLHttpRequest() ) {
    open("POST", "/delete", true);
setRequestHeader( "Content-Type", "application/x-www-form-urlencoded" );


    send(q);
};
} );