// Extra functies ten behoeve van de opmaak van het cms
    
    function add(smiley) {
	    document.getElementById("bericht").value = document.getElementById("bericht").value + ' ' + smiley;
	    document.getElementById("bericht").focus();
    }
    
    function do_slider() {
      Effect.toggle('writegastenboek','slide'); 
      // Check which id is visible. 
      // We need to know this because we need to know the order in which to appear the span
      if(document.getElementById("up").style.display == 'none') {
        Effect.toggle('down', 'appear');
        setTimeout("Effect.toggle('up', 'appear')", 900);
      } else {
        Effect.toggle('up', 'appear');
        setTimeout("Effect.toggle('down', 'appear')", 900); 
      }
      return false;
    }
    
    function check_form() {
      
      if( document.getElementById("naam").value == '' || 
          document.getElementById("onderwerp").value == '' || 
          document.getElementById("bericht").value == '' ) {       
        return false;
      } else {
        return true;
      }
    }