function activate_picture(id){
	for (i=1; i<500; i++) {
		element = document.getElementById("image_paler_"+i);
		if (element){
			element.style.visibility="visible";
		}
	}
	
	 element = document.getElementById("image_paler_"+id);
	 element.style.visibility="hidden";
}

function deactivate_picture(id){
	 for (i=1; i<500; i++) {
		element = document.getElementById("image_paler_"+i);
		if (element){
			element.style.visibility="hidden";
		}
	}
	 
}