var i = 1;
	var galeria = document.getElementById('galeria');
	galeria.style.backgroundImage="url("+imag[0]+")";
		pic1= new Image(100,25); 
	var migaleria = setInterval( function() {
		pic1.src=imag[i+1]; 
		galeria.style.backgroundImage="url("+imag[i]+")";
		i++;
		if(i >= imag.length) {
			i=0;
		}
	}, 7000);