// Helper functions for the popup functionality.

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.. note: this won't find nested layers
		return document.layers[objectId];
	}
	else
	{
		return false;
	}
}

function changeObjectVisibility(objectId, newVisibility)
{
	// Get a reference to the cross-browser style object and make sure the object exists.
	var styleObject = getStyleObject(objectId);
	if (styleObject)
	{
		styleObject.visibility = newVisibility;
		return true;
	}
	else
	{
		// We couldn't find the object, so we can't change its visibility.
		return false;
	}
}

function moveObject(objectId, newXCoordinate, newYCoordinate)
{
	// Get a reference to the cross-browser style object and make sure the object exists.
	var styleObject = getStyleObject(objectId);
	if (styleObject)
	{
		styleObject.left = newXCoordinate;
		styleObject.top = newYCoordinate;
		return true;
	}
	else
	{
		// We couldn't find the object, so we can't very well move it.
		return false;
	}
}