function displaySubMenu() {
var link_blog = document.getElementById("link_blog");
link_blog.style.height = "200px";
link_blog.style.zIndex = "200";
var forum = document.getElementById("dev_forum");
forum.style.display = "block";
var blog = document.getElementById("dev_blog");
blog.style.display = "block";
onMouseFlag = true;
};

function hideSubMenu() {
var forum = document.getElementById("dev_forum");
forum.style.display = "none";
var blog = document.getElementById("dev_blog");
blog.style.display = "none";
var link_blog = document.getElementById("link_blog");
link_blog.style.height = "50px";
}