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 hiddenLayer2() {
init();
if(IE) eval('document.all["descr2"].style.visibility = "hidden"')
if(NC) eval('document.layers["descr2"].visibility = "hidden"')
if(Opera) eval('document.getElementById("descr2").style.visibility = "hidden"')
}

function hiddenLayer3() {
init();
if(IE) eval('document.all["descr3"].style.visibility = "hidden"')
if(NC) eval('document.layers["descr3"].visibility = "hidden"')
if(Opera) eval('document.getElementById("descr3").style.visibility = "hidden"')
}

function hiddenLayer4() {
init();
if(IE) eval('document.all["descr-p"].style.visibility = "hidden"')
if(NC) eval('document.layers["descr-p"].visibility = "hidden"')
if(Opera) eval('document.getElementById("descr-p").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"')
}

function showLayer2() {
init();
if(IE) eval('document.all["descr2"].style.visibility = "visible"')
if(NC) eval('document.layers["descr2"].visibility = "visible"')
if(Opera) eval('document.getElementById("descr2").style.visibility = "visible"')
}

function showLayer3() {
init();
if(IE) eval('document.all["descr3"].style.visibility = "visible"')
if(NC) eval('document.layers["descr3"].visibility = "visible"')
if(Opera) eval('document.getElementById("descr3").style.visibility = "visible"')
}

function showLayer4() {
init();
if(IE) eval('document.all["descr-p"].style.visibility = "visible"')
if(NC) eval('document.layers["descr-p"].visibility = "visible"')
if(Opera) eval('document.getElementById("descr-p").style.visibility = "visible"')
}