function swapPhoto1(photoSRC,theCaption,theCredit) {

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

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

    }
  }  
function swapPhoto2(photoSRC,theCaption) {

if (document.getElementById("caption")) {
	var theImage = document.getElementById("mainPhoto");
	var displayedCaption = document.getElementById("caption");	
	var imgFolder = "p/";
	displayedCaption.firstChild.nodeValue = theCaption;	
	theImage.setAttribute("src", imgFolder+photoSRC);	
    }
  }