function show(id){
	var container = document.getElementById("project-images"); 
	var images = container.getElementsByTagName("li"); 

        if(document.getElementById(id).style.display=="none"){
                for(i=0;i<images.length;i++){
                        images[i].style.display="none";
                }

                document.getElementById(id).style.display="block";
        }
        else{
                document.getElementById(id).style.display="none";
        }
}