var form = "body > section > div > div > form > fieldset > input";
var username_val = 'oooo';
var password_val = 'iiii';
casper.start(login, function () {
    this.wait(Math.floor(Math.random() * 100) + 100);
    casper.sendKeys(username, username_val);
    this.wait(Math.floor(Math.random() * 100) + 100);
    casper.sendKeys(password, password_val);
    this.wait(Math.floor(Math.random() * 100) + 100);
    this.click(form);


});