function showObject(targetObjectId, secondClick) 
{
	if (targetObjectId != window.currentObject) 
	{
		hideObject();
		if( changeObjectVisibility(targetObjectId, 'visible') ) 
		{
	   	window.currentObject = targetObjectId;
	   	return true;
		} else 
		{
	   	return false;
		}
	} else if (secondClick == 'hide') 
	{
		hideObject();
		return true;
	} else if (secondClick == 'go') 
	{
		return false;
	} else 
	{
		return true;
	}
}

function hideObject() 
{
	if(window.currentObject) 
	{
		changeObjectVisibility(window.currentObject, 'hidden');
		window.currentObject = false;
	}
}

function changeObjectVisibility(objectId, newVisibility) 
{
   var styleObject = getStyleObject(objectId);
   if(styleObject) 
   {
		styleObject.visibility = newVisibility;
		return true;
   } else 
   {
		return false;
   }
}

function getStyleObject(objectId) 
{
	// cross-browser function to get an object's style object given its id
   if(document.getElementById && document.getElementById(objectId)) 
   {
		// W3C DOM
		return document.getElementById(objectId).style;
   } else if (document.all && document.all(objectId)) 
   {
		// MSIE 4 DOM
		return document.all(objectId).style;
   } else if (document.layers && document.layers[objectId]) 
   {
		// NN 4 DOM
		return document.layers[objectId];
   } else 
   {
		return false;
   }
}