i was wonder ing

[fbrown]

im a newbe to javascript and i was hopeing some one could explain this peice of code so i could understand better how this works so that i may build one like it to do what i need

 

 

var openedMenu = '';
function ShowMenu(menuId)
{
HideMenu();
var el = document.all[menuId]
if (el) {
if(!el.flag) {
if(el.style.posLeft)
el.posLeft = document.all['_'+menuId].offsetParent.offsetLeft;
else
el.style.left = document.all['_'+menuId].offsetParent.offsetLeft;
el.flag = true;
}
el.style.visibility = 'visible';
}
openedMenu = menuId;
}
function HideMenu(menuId)
{
if (openedMenu) if (document.all[openedMenu]) document.all[openedMenu].style.visibility = 'hidden';
}