var imageOn		= new Image();
imageOn.src		= "images/" + imageOnSrc;

var imageOff	= new Image();
imageOff.src	= "images/" + imageOffSrc;


function switchOff( container )
{
	for ( i = 0; i < container.childNodes.length; i++ )
	{
		if ( container.childNodes[i].nodeName == "IMG" )
		{
			container.childNodes[i].src = imageOff.src;
		}
	}
}

function switchOn( container )
{
	for ( i = 0; i < container.childNodes.length; i++ )
	{
		if ( container.childNodes[i].nodeName == "IMG" )
		{
			container.childNodes[i].src = imageOn.src;
		}
	}
}