function browsercheck2() {
if (navigator.platform.indexOf('Win') > -1) {
zeigen('mbutton');
}
}

function zeigen(objnam)
{
if(document.layers)
document.layers[objnam].visibility="show";
else if(document.all)
document.all[objnam].style.visibility="visible";
else if(document.getElementById)
document.getElementById(objnam).style.visibility="visible";
}