function swapPhoto(photoSRC,theCaption,theCredit) {

if (document.getElementById("caption")) {

	var theImage = document.getElementById("mainPhoto");
	var displayedCaption = document.getElementById("caption");
	var displayedCredit = document.getElementById("credit");
	var imgFolder = "images/";
	displayedCaption.firstChild.nodeValue = theCaption;
	displayedCredit.firstChild.nodeValue = theCredit;
	theImage.setAttribute("src", imgFolder+photoSRC);

    }
  }

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_no_ro_01 = newImage('images/btns/no_ro_01.jpg');
		pre_no_ro_02 = newImage('images/btns/no_ro_02.jpg');
		pre_no_ro_03 = newImage('images/btns/no_ro_03.jpg');
		pre_no_ro_04 = newImage('images/btns/no_ro_04.jpg');
		pre_no_ro_05 = newImage('images/btns/no_ro_05.jpg');
		pre_no_ro_06 = newImage('images/btns/no_ro_06.jpg');
		pre_no_ro_07 = newImage('images/btns/no_ro_07.jpg');
		pre_no_ro_08 = newImage('images/btns/no_ro_08.jpg');
		pre_no_ro_09 = newImage('images/btns/no_ro_09.jpg');
		pre_no_ro_10 = newImage('images/btns/no_ro_10.jpg');
		preloadFlag = true;
	}
}