function pre(){
data = new Array("image/load.gif","image/topw.gif","image/bottomw.gif","image/leftw.gif","image/rightw.gif","image/ltw.gif","image/rtw.gif","image/lbw.gif","image/rbw.gif","image/logow.gif","image/address.gif","image/message.gif","image/btn/home3.gif","image/btn/kaiko1.gif","image/btn/sys1.gif","image/btn/staff1.gif","image/btn/seito1.gif","image/btn/toi1.gif","image/btn/access1.gif","image/btn/link1.gif","image/tab/new1.gif","image/tab/kiso1.gif","image/tab/office1.gif","image/tab/shikaku1.gif","image/tab/net1.gif","image/tab/syumi1.gif","image/tab/tabline.gif","image/taiken1.gif","image/btn/btn1.gif","image/linew.gif","image/oshirase.gif","image/mosw.gif","image/banner_hello_s.gif","image/banner_et_s.gif","image/btn/home1.gif","image/btn/home2.gif","image/btn/home4.gif","image/btn/kaiko2.gif","image/btn/kaiko3.gif","image/btn/kaiko4.gif","image/btn/sys2.gif","image/btn/sys3.gif","image/btn/sys4.gif","image/btn/staff2.gif","image/btn/staff3.gif","image/btn/staff4.gif","image/btn/seito2.gif","image/btn/seito3.gif","image/btn/seito4.gif","image/btn/toi2.gif","image/btn/toi3.gif","image/btn/toi4.gif","image/btn/access2.gif","image/btn/access3.gif","image/btn/access4.gif","image/btn/link2.gif","image/btn/link3.gif","image/btn/link4.gif","image/tab/new2.gif","image/tab/new3.gif","image/tab/new4.gif","image/tab/kiso2.gif","image/tab/kiso3.gif","image/tab/kiso4.gif","image/tab/office2.gif","image/tab/office3.gif","image/tab/office4.gif","image/tab/shikaku2.gif","image/tab/shikaku3.gif","image/tab/shikaku4.gif","image/tab/net2.gif","image/tab/net3.gif","image/tab/net4.gif","image/tab/syumi2.gif","image/tab/syumi3.gif","image/tab/syumi4.gif","image/taiken2.gif","image/btn/btn2.gif","image/btn/btn3.gif");
prImg = new Array();
for (i=0; i<data.length; i++)
{
  prImg[i] = new Image();
  prImg[i].src = data[i];
}
}

function swImg(iName,str)
{
  document.images[iName].src = str;
}