function newImage( imgSrc ){

	var imgName = new Image();
	imgName.src = imgSrc;

	return imgName;
}

function change( imgName, imgLocation )
{
	document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 	if (document.images)
 	{
 	//****Edit this list to include rollover state images ****
 	//****Example: aboutus_over = newImage( "images/aboutus-over.gif" );
 	btn1 = newImage("img/btnEmpresaOn.gif");
	btn2 = newImage("img/btnCatalogoOn.gif");
	btn3 = newImage("img/btnPuntosDeVentaOn.gif");
	btn4 = newImage("img/btnContactarOn.gif");
	

 	preloadFlag = true;
 	}
}