function displayImage(index, parent)
{
 	var images = document.getElementById(parent).getElementsByTagName("div");
	for(var i = 0; i < images.length; i++) 
	{
		var image = images[i];
		if (image.className == 'pimage')  
		{ 
			if(i == index-1) 
			{
	    			image.style.display="block";
	  		}
			else 
			{
	    			image.style.display="none";
	  		}
		}
	}	
}