function dropmenu()
{
	document.getElementById('sub_menu1').style.display="none";
	document.getElementById('sub_menu2').style.display="none";
	document.getElementById('sub_menu3').style.display="none";
}

function dropmenu1()
{
	document.getElementById('sub_menu1').style.display="block";
	document.getElementById('sub_menu2').style.display="none";
	document.getElementById('sub_menu3').style.display="none";
}
function dropmenu1_close()
{
	document.getElementById('sub_menu1').style.display="none";
}
function dropmenu2()
{
	document.getElementById('sub_menu2').style.display="block";
	document.getElementById('sub_menu1').style.display="none";
	document.getElementById('sub_menu3').style.display="none";
}
function dropmenu2_close()
{
	document.getElementById('sub_menu2').style.display="none";
}
function dropmenu3()
{
	document.getElementById('sub_menu3').style.display="block";
	document.getElementById('sub_menu1').style.display="none";
	document.getElementById('sub_menu2').style.display="none";
}
function dropmenu3_close()
{
	document.getElementById('sub_menu2').style.display="none";
}