function showmenu(elmnt)
{
document.getElementById(elmnt).style.visibility="visible"
}
function hidemenu(elmnt)
{
document.getElementById(elmnt).style.visibility="hidden"
}
function chBg(elmnt,clr,bkclr)
{
document.getElementById(elmnt).style.background=(bkclr);
document.getElementById(elmnt).style.color=(clr)
}