//Setup an array containing the images.
	var revert = new Array();
	var imagenames = new Array('btn_aboutus', 'btn_services', 'btn_faq', 'btn_newsletter');

// Preload the images.
	if (document.images)
	{
		var flipped = new Array();
		for(i=0; i< imagenames.length; i++)
		{
			flipped[i] = new Image();
			flipped[i].src = "images/" + imagenames[i] + "(highlighted).jpg";
		}
	}



function over(num)
{
	if(document.images)
	{
		revert[num] = document.images[imagenames[num]].src;
		document.images[imagenames[num]].src = flipped[num].src;
	}
}

function out(num)
{
	if(document.images)
		document.images[imagenames[num]].src = revert[num];
}