function emptyAantal(theBox, theField)
{
  if (document.forms['bestelFrom'].elements[theBox].checked === false)
  {
  	document.forms['bestelFrom'].elements[theField].value = '';
  }
}

function setBox(theBox, theField)
{
	if (document.forms['bestelFrom'].elements[theField].value > 0)
	{
		if (document.forms['bestelFrom'].elements[theBox].checked === false)
    {
    	document.forms['bestelFrom'].elements[theBox].checked = true;
    }
	}
	else
	{
		if (document.forms['bestelFrom'].elements[theField].value == '')
	  {
	  	document.forms['bestelFrom'].elements[theBox].checked = false;
	  }
	}	
}

function createResponse() 
{ 
  document.getElementById( 'response' ).value = hex_sha512( hex_sha512( document.getElementById( 'password' ).value ) + ":" + document.getElementById( 'challenge' ).value ); 
  document.getElementById( 'password' ).value = ""; 
  document.getElementById( 'challenge' ).value = ""; 
  return true;
} 

 var rotate_delay = 4500; // delay in milliseconds (5000 = 5 secs)
    current = 0;
    function next() {
    if (document.slideform.slide[current+1]) {
    document.images.show.src = document.slideform.slide[current+1].value;
    document.slideform.slide.selectedIndex = ++current;
    var nummer = current+1;
    var head1 = document.getElementById("cur_nummer");
     head1.firstChild.nodeValue=nummer;
       }
    else{
    	 first();
    	 var eerste = '1';
    	 var head1 = document.getElementById("cur_nummer");
    	 head1.firstChild.nodeValue=eerste;
    	}
    }
    function previous() {
    if (current-1 >= 0) {
    document.images.show.src = document.slideform.slide[current-1].value;
    document.slideform.slide.selectedIndex = --current;
    var nummer = current+1;
    var head1 = document.getElementById("cur_nummer");
     head1.firstChild.nodeValue=nummer;
       }
    else {
    	last();
    	var maxaantal = document.forms['slideform'].elements['total_img'].value;
    	var head1 = document.getElementById("cur_nummer");
    	 head1.firstChild.nodeValue=maxaantal;
      }
    }
    function first() {
    current = 0;
    document.images.show.src = document.slideform.slide[0].value;
    document.slideform.slide.selectedIndex = 0;
    }
    function last() {
    current = document.slideform.slide.length-1;
    document.images.show.src = document.slideform.slide[current].value;
    document.slideform.slide.selectedIndex = current;
    }
    function ap(text) {
    document.slideform.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
    rotate();
    }
    function change() {
    current = document.slideform.slide.selectedIndex;
    document.images.show.src = document.slideform.slide[current].value;
    var nummer = current+1;
    var head1 = document.getElementById("cur_nummer");
     head1.firstChild.nodeValue=nummer;
    }
    function rotate() {
    if (document.slideform.slidebutton.value == "Stop") {
    current = (current == document.slideform.slide.length-1) ? 0 : current+1;
    document.images.show.src = document.slideform.slide[current].value;
    document.slideform.slide.selectedIndex = current;
    window.setTimeout("rotate()", rotate_delay);
    var nummer = current+1;
    var head1 = document.getElementById("cur_nummer");
     head1.firstChild.nodeValue=nummer;
       }
    }