function newImage(arg) {
rslt = new Image();
rslt.src = arg;
return rslt;
}

function bOver(image) {
document[image].src = eval(image +"_over.src");
}

function bOut(image) {
document[image].src = eval(image +"_out.src");
}

bukai1_out = newImage('images/ryouritsu.gif');
bukai1_over = newImage('images/ryouritsuov.gif');
bukai2_out = newImage('images/ishikikeihatsu.gif');
bukai2_over = newImage('images/ishikikeihatsuov.gif');
bukai3_out = newImage('images/charenge.gif');
bukai3_over = newImage('images/charengeov.gif');
bukai4_out = newImage('images/career.gif');
bukai4_over = newImage('images/careerov.gif');
ic10_out = newImage('images/ic0top.gif');
ic10_over = newImage('images/ic0topov.gif');
ic11_out = newImage('images/ic1kagaku.gif');
ic11_over = newImage('images/ic1kagakuov.gif');
ic12_out = newImage('images/ic2shiennin.gif');
ic12_over = newImage('images/ic2shienninov.gif');
ic13_out = newImage('images/ic3ikuji.gif');
ic13_over = newImage('images/ic3ikujiov.gif');
ic14_out = newImage('images/ic4ryouritsu.gif');
ic14_over = newImage('images/ic4ryouritsuov.gif');
ic15_out = newImage('images/ic5kouenkai.gif');
ic15_over = newImage('images/ic5kouenkaiov.gif');
ic16_out = newImage('images/ic6qa.gif');
ic16_over = newImage('images/ic6qaov.gif');
narawu_out = newImage('images/narawu.gif');
narawu_over = newImage('images/narawuov.gif');
gakkyoukai_out = newImage('images/gakkyoukai.gif');
gakkyoukai_over = newImage('images/gakkyoukaiov.gif');
jst_out = newImage('images/jst.gif');
jst_over = newImage('images/jstov.gif');