function showmenu(el){
	el=document.getElementById(el);
	el.style.display="block";
}

function hidemenu(el){
	el=document.getElementById(el);
	el.style.display="none";
}

function changebcolor(el){
	el.style.background="#4b4b4b";
}
function gobcolor(el){
	el.style.background="transparent";
}