function gradient(id, level){
	var box = document.getElementById(id);
	box.style.opacity = level;
	box.style.MozOpacity = level;
	box.style.KhtmlOpacity = level;
	box.style.filter = "alpha(opacity=" + level * 100 + ")";
	box.style.display="block";
	return;
}

function fadein(id){
	var level = 0;
	while(level <= 1){
		setTimeout( "gradient('" + id + "'," + level + ")", (level* 1000) + 10);
		level += 0.01;
	}
}

function openbox(fadin) {
  var box = document.getElementById('box'); 
  document.getElementById('filter').style.display='block';

  if(fadin) {
	 gradient("box", 0);
	 fadein("box");
  } else { 	
    box.style.display='block';
  }  	
}

function closebox(){
   document.getElementById('box').style.display='none';
   document.getElementById('filter').style.display='none';
}