// Simple dropdown menu implementation
var ddmenuitem	= 0;

// open hidden layer
function mopen(id)
{	
	// close old layer
	if (ddmenuitem)
		ddmenuitem.style.display = 'none';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.display = 'block';

}
// close showed layer
function mclose()
{
	if (ddmenuitem)
		ddmenuitem.style.display = 'none';
}

// close layer when click-out
document.onclick = mclose;