function showAns(theSpan,id)
{
var myImages=new Image();
myImages[0] = "./images/mark.gif";
myImages[1] = "./images/mark1.gif";

if(theSpan.style.display == "none")
	{  document.getElementById(id).src = myImages[1];
	   theSpan.style.display=""; }
else if(theSpan.style.display =="")
	{  document.getElementById(id).src = myImages[0];
	   theSpan.style.display = "none";}
else	{  document.getElementById(id).src = myImages[0];
	   theSpan.style.display = "none"; }
}