var eypos=-200, ejump=-4;
var typos=-260, tjump=-4;
var delay=2;
function do_menue()
{
    if(typos>-260)
    {
        tjump=-4;
        if(typos>=130)
        head_fahren();
    }
    ejump=-ejump;
    if(eypos<=-200 || eypos>=20)
    menue_fahren();
}


function menue_fahren()
{
    if(document.layers) document.menue.top=eypos; else document.all.menue.style.top=eypos;
    eypos+=ejump;
    if(eypos>-200 && eypos<20)
    setTimeout("menue_fahren()", delay);
}

function do_head()
{
    if(eypos>-200)
    {
        ejump=-4;
        if(eypos>=20)
        menue_fahren();
    }
        tjump=-tjump;
        if(typos<=-260 || typos>=130)
        head_fahren();
}

function head_fahren()
{
    if(document.layers) document.head.top=typos; else document.all.head.style.top=typos;
    typos+=tjump;
    if(typos>-260 && typos<130)
    setTimeout("head_fahren()", delay);
}

function init() {                                                                                                            
IE = (document.all)                                                                                                          
NC = (document.layers)                                                                                                       
Opera = (document.getElementById)                                                                                            
}                                                                                                                            
                                                                                                                             
function hiddenLayer() {                                                                                                     
init();                                                                                                                      
if(IE) eval('document.all["descr"].style.visibility = "hidden"')                                                             
if(NC) eval('document.layers["descr"].visibility = "hidden"')                                                                
if(Opera) eval('document.getElementById("descr").style.visibility = "hidden"')                                               
}                                                                                                                            

function showLayer() {                                                                                                       
init();                                                                                                                      
if(IE) eval('document.all["descr"].style.visibility = "visible"')                                                            
if(NC) eval('document.layers["descr"].visibility = "visible"')                                                               
if(Opera) eval('document.getElementById("descr").style.visibility = "visible"')                                              
}