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

function changeImages() {
if (document.images && (preloadFlag == true)) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
}
}
}

var preloadFlag = false;
function preloadImages() {
if (document.images) {
top_corpnavi_explanation_top_corpnavi_tbs_o = newImage("images/top_corpnavi_explanation-to.gif");
top_corpnavi_explanation_top_corpnavi_ybc_o = newImage("images/top_corpnavi_explanation-04.gif");
top_corpnavi_explanation_top_corpnavi_orc_o = newImage("images/top_corpnavi_explanation-05.gif");
top_corpnavi_explanation_top_corpnavi_tfprc_o = newImage("images/top_corpnavi_explanation-06.gif");
top_corpnavi_explanation_top_corpnavi_tip_o = newImage("images/top_corpnavi_explanation-07.gif");
top_corpnavi_explanation_top_corpnavi_mts_o = newImage("images/top_corpnavi_explanation-08.gif");
top_corpnavi_explanation_top_corpnavi_tfp_o = newImage("images/top_corpnavi_explanation-09.gif");
top_corpnavi_explanation_top_corpnavi_ypi_o = newImage("images/top_corpnavi_explanation-10.gif");
top_corpnavi_explanation_top_corpnavi_web_o = newImage("images/top_corpnavi_explanation-11.gif");
top_corpnavi_kansa_o = newImage("images/top_corpnavi_kansa-o.gif");
top_corpnavi_tbs_o = newImage("images/top_corpnavi_tbs-o.gif");
top_corpnavi_zeirisi_o = newImage("images/top_corpnavi_zeirisi-o.gif");
top_corpnavi_ybc_o = newImage("images/top_corpnavi_ybc-o.gif");
top_corpnavi_cg_top_corpnavi_mts_o = newImage("images/top_corpnavi_cg-top_corpnav.gif");
top_corpnavi_orc_o = newImage("images/top_corpnavi_orc-o.gif");
top_corpnavi_tfprc_o = newImage("images/top_corpnavi_tfprc-o.gif");
top_corpnavi_tip_o = newImage("images/top_corpnavi_tip-o.gif");
top_corpnavi_mts_o = newImage("images/top_corpnavi_mts-o.gif");
top_corpnavi_tfp_o = newImage("images/top_corpnavi_tfp-o.gif");
top_corpnavi_ypi_o = newImage("images/top_corpnavi_ypi-o.gif");
top_corpnavi_web_o = newImage("images/top_corpnavi_web-o.gif");
preloadFlag = true;
}
}