function preloadImages() {
		total = 17;
		imageBasePath = "/i/ne/vs/2002/01/";
		imageBaseName = "s";
		imageExt = ".gif";

		imagesOff = new Array();
		imagesOn = new Array();

		for (x=1; x<=total; x++) {

			imagesOff[x] = new Image();
			imagesOff[x].src = imageBasePath+imageBaseName+x+"_o"+imageExt;

			imagesOn[x] = new Image();
			imagesOn[x].src = imageBasePath+imageBaseName+x+"_r"+imageExt;
		}
	}

	doPop = (document.getElementById) ? true : false;
	doImg = (document.images) ? true : false;
	if (doImg) preloadImages();

	//just for test
	//document.write('doPop='+doPop+'<br>doImg='+doImg+'<br>');

	function toggleInfo(thisOne, x) {

		if (doImg) {
			swapImg = (x==1) ? imagesOn[thisOne].src : imagesOff[thisOne].src;
			document.images["rimg"+thisOne].src = swapImg;
		}

		if (doPop) {
			vizValue = (x==1) ? "visible" : "hidden";
			document.getElementById("r"+thisOne).style.visibility = vizValue;
		}

	}