function getScreenHeight()
{
   return screen.height
}

function getScreenWidth()
{
 return screen.width
}



function showSubMenu(submenu)
{
	var element = document.getElementById(submenu);
	element.style.display = "block";
}

function hideSubMenu(submenu)
{
	var element = document.getElementById(submenu);
	element.style.display = "none";

}