//<![CDATA[
number = 1;
function changeBg()
{
	var tdBG					= document.getElementById("content");	
	tdBG.style.backgroundImage	= "url('/img/sfondo_" +  number + ".gif')";
	number ++;
	if (number==3)			{number = 1;}
}
function init()
{
	var ww;var myImg 					= new Image();
	for (ww=1;ww<3;ww++){	myImg.src 	= "/img/sfondo_" +  ww + ".gif";}
	setInterval("changeBg()",7000);
}
window.onload = init;
//]]>