Event.observe(window, "load", function(){
    window.name = 'psi';

    Event.observe($("login_btn"), "click", togglefade);
    $("login_window").style.display = 'none';
})

function goback(){
    history.back(-1);
}

var togglefade_status = 0;
function togglefade(evt){
    if(togglefade_status == 0){
        togglefade_status = 1;
        new Effect.Appear('login_window', { duration: 1.0 });
        //new Effect.Fade('login_window', { duration: 1.0 });
    } else {
        togglefade_status = 0;
        $('login_window').fade({ duration: 1.0 });
        //new Effect.Fade('login_window', { duration: 2.0 });
    }
    Event.stop(evt);
}

function add_zubehoer(target) {
    var src = $(target).src.split("/");

    var id = target.split("_");
    id = id[id.length-1];

    if(src[src.length-1] == 'tab_box_zubehoer_chkbox_act.gif') {
        $(target).src = 'images/tab_box_zubehoer_chkbox.gif';
        $("stck_"+id).style.visibility = "hidden";
        $("stck_"+id).value = 0;
        $(target).up("tr").className = "";
        $(target).up("tr").next("tr").className = "";
    }else{
        $(target).src = 'images/tab_box_zubehoer_chkbox_act.gif';
        $("stck_"+id).style.visibility = "visible";
        $("stck_"+id).value = 1;
        $(target).up("tr").className = "selected";
        $(target).up("tr").next("tr").className = "selected";
    }

}

function ElementExists(ElementName) {
  if (isNaN(document.getElementById(ElementName))) {
    return true;
  } else {
    return false;
  }
}