var menu = new Array(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);
var menu_img = new Array();



menu_img[0] = new Image(); menu_img[0].src = "images/menu_02.gif";
menu_img[1] = new Image(); menu_img[1].src = "images/menu_lo_02.gif";
menu_img[2] = new Image(); menu_img[2].src = "images/menu_03.gif";
menu_img[3] = new Image(); menu_img[3].src = "images/menu_lo_03.gif";
menu_img[4] = new Image(); menu_img[4].src = "images/menu_04.gif"; 
menu_img[5] = new Image(); menu_img[5].src = "images/menu_lo_04.gif";
menu_img[6] = new Image(); menu_img[6].src = "images/menu_05.gif"; 
menu_img[7] = new Image(); menu_img[7].src = "images/menu_lo_05.gif";
menu_img[8] = new Image(); menu_img[8].src = "images/menu_06.gif"; 
menu_img[9] = new Image(); menu_img[9].src = "images/menu_lo_06.gif";

function chg_img(id,num)
{
	document.images[id].src = menu_img[num].src;
}


function hid()
{

	document.getElementById('ex0').style.display = "none";
	document.getElementById('ex1').style.display = "none";
	document.getElementById('ex2').style.display = "none";
	document.getElementById('ex3').style.display = "none";
	document.getElementById('ex4').style.display = "none";
	document.getElementById('ex5').style.display = "none";
	document.getElementById('ex6').style.display = "none";
	document.getElementById('ex7').style.display = "none";
	document.getElementById('ex8').style.display = "none";
	document.getElementById('ex9').style.display = "none";
	document.getElementById('ex10').style.display = "none";
	document.getElementById('ex11').style.display = "none";
	document.getElementById('ex12').style.display = "none";
	document.getElementById('ex13').style.display = "none";
	document.getElementById('ex14').style.display = "none";
	document.getElementById('ex15').style.display = "none";
	document.getElementById('ex16').style.display = "none";
	document.getElementById('ex17').style.display = "none";
	document.getElementById('ex18').style.display = "none";
	document.getElementById('ex19').style.display = "none";

}


function c_dis(num,id)
{
	if(menu[num] == 0)
	{
		document.getElementById(id).style.display = "block";
		menu[num] = 1;
	}else
	{
		document.getElementById(id).style.display = "none";
		menu[num] = 0;
	}
}