function preLoadImg(){
	arrPreLoad = new Array();
	for (i in arrImgList) {
		arrPreLoad[i] = new Image();
		arrPreLoad[i].src = arrImgList[i];
	}
	preLoadFlag = "true";
}

function chgImg(fileName,imgName){
	if (preLoadFlag == "true") {
		document.images[imgName].src = fileName;
	}
}

var preLoadFlag = "false";
arrImgList = new Array(
	"common/bm_navi1.gif",
	"common/bm_navi2.gif",
	"common/bm_navi3.gif",
	"common/bm_navi4.gif"
);
window.onload = preLoadImg;

var Default = 2;
var tags    = new Array('div','td','tr','th','p');
var sizing  = new Array('12px','12px','14px');

function FontChange(target,tarF) {
  if (!document.getElementById) return
  var dore = document,tarS = null,fontSize = Default,value,su,cTags;fontSize += tarF;
  if (fontSize < 0) fontSize = 0;
  if (fontSize > 2) fontSize = 2;
  Default = fontSize;
  if (!(tarS = dore.getElementById(target))) tarS = dore.getElementsByTagName(target)[0];
  tarS.style.fontSize = sizing[fontSize];
  for (value = 0 ; value < tags.length ; value++) {
    cTags = tarS.getElementsByTagName(tags[value]);
    for (su = 0 ; su < cTags.length ; su++) cTags[su].style.fontSize = sizing[fontSize];
  }
}