menuItem1 =
[[" "],
["選択してください","大気","真空","防水"],
["選択項目なし"],
["選択してください","大気","真空"],
["選択項目なし"] ];

menuItem2 =
[[" "],
["選択してください","シングル","ツイン"],
["選択項目なし"],
["選択してください","シングル","ツイン"],
["選択項目なし"] ];

menuItem3 =
[[" "],
["選択してください","150mm以下","200mm以下","200〜300mm","450mm"],
["選択してください","50mm","75mm","100mm","125mm","150mm","200mm","300mm"],
["選択してください","第2世代(400x500)","第3世代(550x650),(620x720)","第4世代(680x880),(730x920)","第5世代(1000x1300)"],
["選択項目なし"] ];

function setMenuItem1(n)
{
len = document.myForm.Computer1.options.length;
for (i=len-1; i>=0; i--)
{
document.myForm.Computer1.options[i] = null;
}
for (i=0; i<menuItem1[n].length; i++)
{
document.myForm.Computer1.options[i] = new Option(menuItem1[n][i],i);
}
}

function setMenuItem2(n)
{
len = document.myForm.Computer2.options.length;
for (i=len-1; i>=0; i--)
{
document.myForm.Computer2.options[i] = null;
}
for (i=0; i<menuItem2[n].length; i++)
{
document.myForm.Computer2.options[i] = new Option(menuItem2[n][i],i);
}
}

function setMenuItem3(n)
{
len = document.myForm.Computer3.options.length;
for (i=len-1; i>=0; i--)
{
document.myForm.Computer3.options[i] = null;
}
for (i=0; i<menuItem3[n].length; i++)
{
document.myForm.Computer3.options[i] = new Option(menuItem3[n][i],i);
}
}





function changeMap(n)
{
for (i=1; i<4; i++) document.images["map"+i].style.visibility = "hidden";
document.images["map"+n].style.visibility = "visible";
}