// Preload MouseOver Images
var use_images = new Array("");
var pl_images = new Array();
for(i=0;i<use_images.length;i++)
{
   pl_images[i] = new Image();
   pl_images[i].src = "images/" + use_images[i];
}

// SubMenu Operation
var submenuin = "";
var submenutime = 100;
function showSubMenu(menuID)
{
   submenuin = menuID;
   document.getElementById(menuID).style.display = "block";
}
function hideSubMenu(menuID)
{
   setTimeout("doHideSubMenu('" + menuID + "')",submenutime);
   submenuin = "";
}
function doHideSubMenu(menuID)
{
   if(submenuin != menuID)
      document.getElementById(menuID).style.display = "none";
}