function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function toggle_sections(show_section, hide_sections) {
	var ele = document.getElementById(show_section.toLowerCase());
	ele.style.display = "block";
	
	to_hide = hide_sections.split(',');
	var j;
	for (j = 0; j < to_hide.length; j++)
	{
		ele = document.getElementById(to_hide[j].toLowerCase());
	  ele.style.display = "none";
	}
	
	update_action_stage(show_section);
	update_print_options(show_section); //function defined in _belt_info.html.erb
	show_completed_box(show_section);
	show_hide_comment_sections(show_section, hide_sections);
	update_prev_next(show_section);
}

function show_hide_comment_sections(show_section, hide_sections) {
	var ele = document.getElementById(show_section.toLowerCase() + '_stage_teacher_comment');
	if (ele != null) {
		ele.style.display = "block";
  }
	
	to_hide = hide_sections.split(',');
	var j;
	for (j = 0; j < to_hide.length; j++)
	{
		ele = document.getElementById(to_hide[j].toLowerCase() + '_stage_teacher_comment');
		if (ele != null) {
	  	ele.style.display = "none";
    }
	}
	
}

function show_completed_box(show_section) {
	var ele = document.getElementById("completed_box");
  if (show_section == 'After' & ele != null) {
  	ele.style.display = "block";
  }
  else if (ele != null) {
		ele.style.display = "none";
  }
}

function update_action_stage(value) {
	var ele = document.getElementById("action_stage");
	ele.value = value;
	ele = document.getElementById("action_stage_for_comment");
	if (ele != null) {
		ele.value = value;
	}	
}