var menu
var menuii
var menuiii
var menuiv
function show(submenu)
{
menu = document.getElementById(submenu).style
if(menu.display =="block") { menu.display ="none" }
else { menu.display ="block" }
}
function hidedivs(divone,divtwo,divthree,divfour)
{
menu = document.getElementById(divone).style
menu.display="none"
menuii = document.getElementById(divtwo).style
menuii.display="none"
menuiii = document.getElementById(divthree).style
menuiii.display="none"
menuiv = document.getElementById(divfour).style
menuiv.display="none"
}