function startmenu()
{
	document.getElementById('menu0').style.display = "none";
	document.getElementById('menu1').style.display = "none";
	document.getElementById('menu2').style.display = "none";

}

function openmenu(menu,numb)
{


	for(i=0;i<3;i++)
	{
		if(i==numb)
		{

				document.getElementById(menu).style.display = "block";
		}
		else
		{
			document.getElementById('menu'+i).style.display = "none";
		}
	}
}


function menufunc(menuId)
{
	if(document.getElementById(menuId).style.display == "none")
	{
		startmenu();
		document.getElementById(menuId).style.display = "block";
	}
	else
	{
		startmenu();
	}
}

function changeImage(filename)
{
   document.getElementById('mainimage').src = filename;
}