var _base_ = '../images/';
var _ext_ = 'gif';
var _suffix_ = new Array('on', 'off');
var _img_loaded_ = false;

if (!_img_loaded_) {
    preload('faq', 'chi_siamo', 'glossario', 'focus', 'lavora_con_noi', 'link', 'mappa', 
            'contatti', 'mnu_offerta', 'mnu_demo', 'mnu_esigenze', 
            'mnu_listino', 'mnu_prodotti', 'mnu_rete_comm', 'mnu_offerta', 'mnu_acquista');
    _img_loaded_ = true;
}

function rollover(name, state) {
  if (document.images && self[name + '_' + state]) {
    document.images[name].src = self[name + '_' + state].src;
  }
}

function preload() {
  if(document.images) {
    var sz = arguments.length;
    for(var i = 0; i < sz; i++) {
        var arg = arguments[i];
        for(j = 0; j < _suffix_.length; j++) {
            var suf = _suffix_[j]
            self[arg + '_' + suf] = new Image();
            self[arg + '_' + suf].src = _base_ + arg + '_' + suf + '.' + _ext_;
        }
    }

  }
}