// JavaScript Document

function show_layer(lay) {
	var c_obj = document.getElementById('content_'+lay);
	
	if (c_obj.style.display == 'none') {
		var browser=navigator.appName;
	
		if (browser=="Microsoft Internet Explorer") {
			c_obj.style.display = 'block';
		}
		else {
			c_obj.style.display = 'table-row-group';		
		}
	}
	else {
		c_obj.style.display = 'none';
	}
	return false;
}

function set_tab(id,total) {
	close_tabs(total);
	document.getElementById('tab_'+id).className = 'tab_active';
	
	var browser=navigator.appName;
	
	if (browser=="Microsoft Internet Explorer") {
		document.getElementById('content_'+id).style.display = 'block';
	}
	else {
		document.getElementById('content_'+id).style.display = 'table-row-group';		
	}
}

function close_tabs(total) {
	for (var i=1;i<=total;i++) {
		document.getElementById('tab_'+i).className = 'tab_normal';
		document.getElementById('content_'+i).style.display = 'none';
	}
}

var curr = 1;

function openWin(url, wi, he) {

  var win = window.open(url,'popup_win','width='+wi+',height='+he+',resizable=yes,status=no,toolbar=no,menubar=no, scrollbars=yes');
 
  var b = screen.width;
  var h = screen.height;
 
  b = (b - wi) / 2;
  h = (h - he) / 2;
 
  win.moveTo(b,h);

}

function set_class(obj, naam) {

  obj.className = naam;

}



var hovers = [[ [], [] ],[ [], [] ]] , images = [];

function loadHovers (tag) {

  tag_text = (tag == 0)?'img':'input';

  images[tag] = document.getElementsByTagName ( tag_text );
  
  for ( var i = 0; i < images[tag].length; i ++ ) {

    if ( images[tag].item(i).getAttribute ( 'src' ) && images[tag].item(i).getAttribute ( 'hover' ) ) {
         
      // preload it
    
      ( hovers[tag][0][i] = new Image () ).src=images[tag].item(i).getAttribute('src');
      ( hovers[tag][1][i] = new Image () ).src=images[tag].item(i).getAttribute('hover');
         
      if ( images[tag].item(i).attachEvent ) {
 
        images[tag].item(i).attachEvent ( 'onmouseover', new Function ( "hover(" + i + ", true, '"+tag+"');" ) );
        images[tag].item(i).attachEvent ( 'onmouseout', new Function ( "hover(" + i + ", false, '"+tag+"');" ) );

       } 

       else if ( images.item(i).addEventListener ) {
       
         images[tag].item(i).addEventListener ( 'mouseover', new Function ( "hover(" + i + ", true);" ), true );
         images[tag].item(i).addEventListener ( 'mouseout', new Function ( "hover(" + i + ", false);" ), true );
    
       }
     }
   }

   if (tag != 1) {

     loadHovers(1);

   }

}

function hover ( index, mouseover, tag ) {

   images[tag].item( index ).setAttribute ( 'src', hovers[tag][mouseover?1:0][index].src );

}


function markRow(rowobj, nClass) {
	
  var theCells = null;

  if (rowobj.cells != 'undefined') {

    theCells = rowobj.cells;
	
  }

  else if (rowobj.getElementsByTageName('td')) {

    theCells = rowobj.getElementsByTageName('td');

  }

  cntCells = theCells.length;
  
  if (cntCells > 0) {

    for (i=0;i<cntCells;i++) {
		
      theCells[i].className = nClass;
  
    }

  }

}



function checkForm(form) {

  var aantal = form.elements.length;

  var string = 'U heeft de volgende verplichte veld(en) niet ingevuld: \n';

  string += '_______________________________________________________\n';

  var returnbool = true;

  for (var i=0;i<aantal;i++) {

    if (form.elements[i].type == 'checkbox') {

      if (form.elements[i].title.length > 0 && !form.elements[i].checked) {

	string += form.elements[i].title+'\n';

        returnbool = false;

      }

    }

    else if (form.elements[i].value.length == 0 && form.elements[i].title.length > 0 && !form.elements[i].disabled && form.elements[i].style.display != 'none') {

      string += form.elements[i].title+'\n';

      returnbool = false;

    }

  }

  if (returnbool) {

    return true;

  }

  else {

    string += '______________________________________________________\n';

    string += 'Vul deze velden in om de actie te voltooien';

    alert(string);

    return false;

  }

}