Facebook select all friends

/**Code start
 *Change z=10 if you have less\more friends then 500
 *@param (int) "fu" - from what user to start
 *@param (int) "tu" - what user to end
 *Example: var z=10,fu=10,tu=3000
 *(will select only 2990 users, starting from user number 11)
 *
 *You may use the script without "fu" and "tu"
 *so it will run all over your users from 1 to LAST.
 */
javascript: var z = 10,
    fu=10,
    tu=3000,
    w = window,
    d = "document",
    wd = w[d];

function l() {
    p = wd.getElementsByName("checkableitems[]");
    var le=("undefined"!=typeof tu)?tu:p.length;
    var st=("undefined"!=typeof fu)?fu:0;
    for(count=st;count<le;count++) setTimeout("p[" + count + "].click()", 10);
    alert("All of your friends selected, you may send your spam now")
}
var fbProfileBrowserListContainer = wd.getElementsByClassName("fbProfileBrowserListContainer"),
    f = wd.getElementById(fbProfileBrowserListContainer[1].parentNode.getAttribute("id"));

function b(a) {
    f.scrollTop += 1E7;
    a >= z ? setTimeout("l()", 1E3) : setTimeout("b(" + (a + 1) + ")", 2E3)
}
setTimeout("b(1)", 2E3);
void(0);

//Code end