// image.js

function preLoadImages()
{
	imgArray = new Array();
	imgBase = "image/";

	imgArray["1"]	 = new Image();
	imgArray["1"].src = imgBase + "icon/icon_arDown.gif";
	imgArray["2"]	 = new Image();
	imgArray["2"].src = imgBase + "icon/icon_arUp.gif";
	imgArray["3"]	 = new Image();
	imgArray["3"].src = imgBase + "icon/icon_arleft.gif";
	imgArray["4"]	 = new Image();
	imgArray["4"].src = imgBase + "icon/icon_arright.gif";
	imgArray["5"]	 = new Image();
	imgArray["5"].src = imgBase + "icon/icon_plus.gif";
	imgArray["6"]	 = new Image();
	imgArray["6"].src = imgBase + "icon/icon_min.gif";
}

function swapImage(imgName, strFileNameSwap, strFileNameNorm) {
	if (document.images[imgName].src.indexOf(strFileNameSwap) == -1) {
		document.images[imgName].src = strFileNameSwap;
	}
	else {
		document.images[imgName].src = strFileNameNorm;
	}
}