var w = window;
var d = document;
var location_hash = new Function("return window.location.hash.substring(1)");
var IE = d.all && !w.opera ? true : false;

var smart_top = function() {
    var viewport_height = (self.innerHeight) ? self.innerHeight : (d.documentElement && d.documentElement.clientHeight) ? d.documentElement.clientHeight : (d.body) ? d.body.clientHeight : 0;
    var page_height = d.getElementById('footer').offsetTop;
    var ttl = d.getElementById('top_link').getElementsByTagName('a')[0];
    if (page_height < viewport_height) ttl.style.visibility = 'hidden';
};

var button_hover = function() {
    if (!d.getElementById('send_mail_button')) return;
    var b = d.getElementById('send_mail_button');
    b.onmouseover = b.onmouseout = function() {
        var s = this.getAttribute('src');
        var ns = s.indexOf('_hover') != -1 ? 'img/send_message.gif' : 'img/send_message_hover.gif';
        this.setAttribute('src', ns);
    };
};

var init = function() {
    smart_top();
    button_hover();
};