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;

	}

}





// Open the lightbox





function openbox(formtitle, fadin)

{

  var box = document.getElementById('box'); 

  document.getElementById('filter').style.display='block';



  var btitle = document.getElementById('boxtitle');

  btitle.innerHTML = formtitle;

  

  if(fadin)

  {

	 gradient("box", 0);

	 fadein("box");

  }

  else

  { 	

    box.style.display='block';

  }  	

}





// Close the lightbox

function submitnclosebox()

{
if ( document.ev.naam.value == "" )
    {
        alert ( "Gelieve uw naam in te vullen." );
        return false;
    }
else if ( document.ev.adres.value == "" )
    {
        alert ( "Graag alle velden invullen." );
        return false;
    }
else if ( document.ev.postcode.value == "" )
    {
        alert ( "Graag alle velden invullen." );
        return false;
    }
else if ( document.ev.woonplaats.value == "" )
    {
        alert ( "Graag alle velden invullen." );
        return false;
    }
else if ( document.ev.geb.value == "" )
    {
        alert ( "Graag alle velden invullen." );
        return false;
    }
else if ( document.ev.tel.value == "" )
    {
        alert ( "Graag alle velden invullen." );
        return false;
    }
else if ( document.ev.mail.value == "" )
    {
        alert ( "Graag alle velden invullen." );
        return false;
    }
else if ( document.ev.bsn.value == "" )
    {
        alert ( "U bent vergeten uw BSN/sofi-nummer in te vullen." );
        return false;
    }
  else
    {
   alert("Eigen verklaring verzonden.");

   document.getElementById('box').style.display='none';

   document.getElementById('filter').style.display='none';
   return true;
   }


}





function closebox()

{

   document.getElementById('box').style.display='none';

   document.getElementById('filter').style.display='none';

}