var lastSender=null;
var btnBack=null;
var lastColor;

var firstTime=true;
var contentTdOld=null;

function switchPic(sender,picURL,backText)
{
	if(firstTime)
	{
	firstTime=false;
	contentTdOld=document.getElementById("contentTd").innerHTML;
	}
	
	if(lastSender!=null)
	{
	lastSender.style.color=lastColor;
	}
	lastSender=sender;
	lastColor=sender.style.color;
	sender.style.color="black";	
	document.getElementById("contentTd").innerHTML="<img border='0' src='" + picURL + "' width='330'/> <br/><br/><a href='javascript:returnOld();'> " + backText + "</a>";
	
	btnBack=document.getElementById("btnBack");
	if(btnBack)
	{
		btnBack.style.display="block";
	}
}

function returnOld()
{
	document.getElementById("contentTd").innerHTML=contentTdOld;
}