function u(id, img){	
		document.getElementById(id).src = 'images/'+img;
	}


	function rotateImage(id){
		var new_image = 'images/home_bg_'+generate(1, 3)+'.jpg'
		document.getElementById(id).style.backgroundImage = "url('"+new_image+"')";
	}

	function generate(x, y) {
		var range = y - x + 1;
		return Math.floor(Math.random() * range) + x;
	}