// Dropdown Javascript 
var timeout = 50; 
var closetimer = 0; 
var ddmenuitem = 0; 

// open hidden layer 
function mopen(id) { 
// cancel close timer 
mcancelclosetime(); 
// close old layer 
if(ddmenuitem) ddmenuitem.style.visibility = 'hidden'; 
// get new layer and show it 
ddmenuitem = document.getElementById(id); 
ddmenuitem.style.visibility = 'visible'; } 
// close shown layer 
function mclose() { if(ddmenuitem) ddmenuitem.style.visibility = 'hidden'; } 
// go close timer 
function mclosetime() { closetimer = window.setTimeout(mclose, timeout); } 
// cancel close timer 
function mcancelclosetime() { if(closetimer) { window.clearTimeout(closetimer); closetimer = null; } } 
// close layer when click-out 
document.onclick = mclose;