function mudar_back(){
	reso=screen.width;

	if (reso >= 1680)
	{
		reso=1680;
	
	}
		else if (reso >= 1600) // ris di cappeller
	{
		reso=1600;
	}
	else if (reso >= 1440) // ris di cappeller
	{
		reso=1440;
	}
	else if (reso >= 1280)
	{
		reso=1280;
	}
	else if (reso  >= 1024)
	{
		reso=1024;
	}
	else if (reso >= 800)
	{
		reso=800;
	}
	else
	{
		reso=1024;
	}
	
	// document.body.background='../img/bg/gallery/'+reso+'.jpg';
	document.body.style.backgroundImage='url(img/bg/gallery/'+reso+'.jpg)';
}


function mudar_backLinks(){
	reso=screen.width;

	if (reso >= 1680)
	{
		reso=1680;
	
	}
		else if (reso >= 1600) // ris di cappeller
	{
		reso=1600;
	}
	else if (reso >= 1440) // ris di cappeller
	{
		reso=1440;
	}
	else if (reso >= 1280)
	{
		reso=1280;
	}
	else if (reso  >= 1024)
	{
		reso=1024;
	}
	else if (reso >= 800)
	{
		reso=800;
	}
	else
	{
		reso=1024;
	}
	
	// document.body.background='../img/bg/gallery/'+reso+'.jpg';
	document.body.style.backgroundImage='url(img/bg/links/'+reso+'.jpg)';
}