// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults

function toggle_signup_stuff(student_role_id) {
  var student_signup_fields = "student_signup_fields"
  var normal_signup_fields = "normal_signup_fields"
  var signup_form = "signup_form"
 
  Element.hide(signup_form);
  if ($('user_role_location_id').value != 0 && $('role_id').value != 0) {
 	Element.show(signup_form);
	Element.hide(student_signup_fields);
	Element.hide(normal_signup_fields);
 	if ($('role_id').value == student_role_id) {
 	  if (!Element.visible(student_signup_fields)) {
		  Element.toggle(student_signup_fields);
	  }
	  if (Element.visible(normal_signup_fields)) {
		  Element.toggle(normal_signup_fields)
	  }
	} else {
	  if (Element.visible(student_signup_fields)) {
		  Element.toggle(student_signup_fields);
	  }	
	  if (!Element.visible(normal_signup_fields)) {
		  Element.toggle(normal_signup_fields);
	  }
	}
 } else {
    Element.hide(signup_form);
 }
};


bTextareaWasTinyfied = false; //this should be global, could be stored in a cookie...

function setTextareaToTinyMCE(sEditorID) {
	var oEditor = document.getElementById(sEditorID);
	if(oEditor && !bTextareaWasTinyfied) {
		tinyMCE.execCommand('mceAddControl', true, sEditorID);
		bTextareaWasTinyfied = true;
	}
	return;
}

function unsetTextareaToTinyMCE(sEditorID) {
	var oEditor = document.getElementById(sEditorID);
	if(oEditor && bTextareaWasTinyfied) {
		tinyMCE.execCommand('mceRemoveControl', true, sEditorID);
		bTextareaWasTinyfied = false;
	}
	return;
}

function disableProblem(dom_id) {
	disableForm(dom_id + "_answer_form")
	disableLink(dom_id + "_request_help_link")
	disableLink(dom_id + "_submit_link")
}
function disableLink(id) {
	if(document.getElementById(id)) {
		$(id).removeAttribute("href")
		$(id).setAttribute("onclick", "return false;")
	}
}
function disableForm(id) {
	var form = document.getElementById(id);
	for (i=0;i<form.elements.length;i++) {
		form.elements[i].disabled = true;
	}
}

/* Smooth scrolling
   Changes links that link to other parts of this page to scroll
   smoothly to those links rather than jump to them directly, which
   can be a little disorienting.

   sil, http://www.kryogenix.org/

   v1.0 2003-11-11
   v1.1 2005-06-16 wrap it up in an object
*/
/* 
var ss = {
  fixAllLinks: function() {
    // Get a list of all links in the page
    var allLinks = document.getElementsByTagName('a');
    // Walk through the list
    for (var i=0;i<allLinks.length;i++) {
      var lnk = allLinks[i];
      if ((lnk.href && lnk.href.indexOf('#') != -1) && 
          ( (lnk.pathname == location.pathname) ||
	    ('/'+lnk.pathname == location.pathname) ) && 
          (lnk.search == location.search)) {
        // If the link is internal to the page (begins in #)
        // then attach the smoothScroll function as an onclick
        // event handler
        ss.addEvent(lnk,'click',ss.smoothScroll);
      }
    }
  },

  smoothScroll: function(e) {
    // This is an event handler; get the clicked on element,
    // in a cross-browser fashion
    if (window.event) {
      target = window.event.srcElement;
    } else if (e) {
      target = e.target;
    } else return;

    // Make sure that the target is an element, not a text node
    // within an element
    if (target.nodeType == 3) {
      target = target.parentNode;
    }

    // Paranoia; check this is an A tag
    if (target.nodeName.toLowerCase() != 'a') return;

    // Find the <a name> tag corresponding to this href
    // First strip off the hash (first character)
    anchor = target.hash.substr(1);
    // Now loop all A tags until we find one with that name
    var allLinks = document.getElementsByTagName('a');
    var destinationLink = null;
    for (var i=0;i<allLinks.length;i++) {
      var lnk = allLinks[i];
      if (lnk.name && (lnk.name == anchor)) {
        destinationLink = lnk;
        break;
      }
    }

    // If we didn't find a destination, give up and let the browser do
    // its thing
    if (!destinationLink) return true;

    // Find the destination's position
    var destx = destinationLink.offsetLeft; 
    var desty = destinationLink.offsetTop;
    var thisNode = destinationLink;
    while (thisNode.offsetParent && 
          (thisNode.offsetParent != document.body)) {
      thisNode = thisNode.offsetParent;
      destx += thisNode.offsetLeft;
      desty += thisNode.offsetTop;
    }

    // Stop any current scrolling
    clearInterval(ss.INTERVAL);

    cypos = ss.getCurrentYPos();

    ss_stepsize = parseInt((desty-cypos)/ss.STEPS);
    ss.INTERVAL =
setInterval('ss.scrollWindow('+ss_stepsize+','+desty+',"'+anchor+'")',10);

    // And stop the actual click happening
    if (window.event) {
      window.event.cancelBubble = true;
      window.event.returnValue = false;
    }
    if (e && e.preventDefault && e.stopPropagation) {
      e.preventDefault();
      e.stopPropagation();
    }
  },

  scrollWindow: function(scramount,dest,anchor) {
    wascypos = ss.getCurrentYPos();
    isAbove = (wascypos < dest);
    window.scrollTo(0,wascypos + scramount);
    iscypos = ss.getCurrentYPos();
    isAboveNow = (iscypos < dest);
    if ((isAbove != isAboveNow) || (wascypos == iscypos)) {
      // if we've just scrolled past the destination, or
      // we haven't moved from the last scroll (i.e., we're at the
      // bottom of the page) then scroll exactly to the link
      window.scrollTo(0,dest);
      // cancel the repeating timer
      clearInterval(ss.INTERVAL);
      // and jump to the link directly so the URL's right
      location.hash = anchor;
    }
  },

  getCurrentYPos: function() {
    if (document.body && document.body.scrollTop)
      return document.body.scrollTop;
    if (document.documentElement && document.documentElement.scrollTop)
      return document.documentElement.scrollTop;
    if (window.pageYOffset)
      return window.pageYOffset;
    return 0;
  },

  addEvent: function(elm, evType, fn, useCapture) {
    // addEvent and removeEvent
    // cross-browser event handling for IE5+,  NS6 and Mozilla
    // By Scott Andrew
    if (elm.addEventListener){
      elm.addEventListener(evType, fn, useCapture);
      return true;
    } else if (elm.attachEvent){
      var r = elm.attachEvent("on"+evType, fn);
      return r;
    } else {
      alert("Handler could not be removed");
    }
  } 
}

ss.STEPS = 25;

ss.addEvent(window,"load",ss.fixAllLinks);

*/