function clearindextab()
{
	document.getElementById("dt01").style.backgroundImage = "url('./img/tab_01_off.png')";
	document.getElementById("dt02").style.backgroundImage = "url('./img/tab_02_off.png')";
	document.getElementById("dt03").style.backgroundImage = "url('./img/tab_03_off.png')";
	document.getElementById("dt04").style.backgroundImage = "url('./img/tab_04_off.png')";

	document.getElementById("dd01").style.display = "none";
	document.getElementById("dd02").style.display = "none";
	document.getElementById("dd03").style.display = "none";
	document.getElementById("dd04").style.display = "none";
}

function tabmenu01()
{
	clearindextab();
	document.getElementById("dt01").style.backgroundImage = "url(./img/tab_01_on.png)";
	document.getElementById("dd01").style.display = "block";
}

function tabmenu02()
{
	clearindextab();
	document.getElementById("dt02").style.backgroundImage = "url(./img/tab_02_on.png)";
	document.getElementById("dd02").style.display = "block";
}

function tabmenu03()
{
	clearindextab();
	document.getElementById("dt03").style.backgroundImage = "url(./img/tab_03_on.png)";
	document.getElementById("dd03").style.display = "block";
}

function tabmenu04()
{
	clearindextab();
	document.getElementById("dt04").style.backgroundImage = "url(./img/tab_04_on.png)";
	document.getElementById("dd04").style.display = "block";
}