var revert = new Array();
var inames = new Array('healthcare-buildings', 'off-site-construction','our-services','about-us');

// Preload
if( document.images )
{
	var flipped = new Array();
	for( i = 0; i < inames.length; i++ )
	{
		flipped[i] = new Image();
		flipped[i].src = "images/"+inames[i]+"-over.gif";
	}
}

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

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