try it
function menuclick(str) {
member=document.getElementById(str)
if( member.style.display =='none' )
member.style.display = 'block';
else member.style.display = 'none';
}
function menuclick(str) {
member=document.getElementById(str)
if( member.style.display =='none' )
member.style.display = 'block';
else member.style.display = 'none';
}
if (document.getElementById(str)) {
member=document.getElementById(str);
if( member.style.display =='none' )
member.style.display = 'block';
else member.style.display = 'none';
}
}