function newImage(arg)
	{
	if (document.images)
		{
		rslt = new Image();
		rslt.src = arg;
		return rslt;
		}
	}

function changeImages()
	{
	if (document.images && (preloadFlag == true))
		{
		for (var i=0; i<changeImages.arguments.length; i+=2)
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}

var preloadFlag = false;
function preloadImages()
	{
	if (document.images)
		{
		b1_over = newImage("i/b1-over.jpg");
		b2_over = newImage("i/b2-over.jpg");
		b3_over = newImage("i/b3-over.jpg");
		b4_over = newImage("i/b4-over.jpg");
		b5_over = newImage("i/b5-over.jpg");
		b6_over = newImage("i/b6-over.jpg");
		preloadFlag = true;
		}
	}