/**
 * common dhtml functions
 * these are handy functions i use all the time.
 *
 * by seth banks (webmaster at subimage dot com)
 * http://www.subimage.com/
 *
 * up to date code can be found at http://www.subimage.com/dhtml/
 *
 * this code is free for you to use anywhere, just keep this comment block.
 */

/**
 * x-browser event handler attachment and detachment
 * th: switched first true to false per http://www.onlinetools.org/articles/unobtrusivejavascript/chapter4.html
 *
 * @argument obj - the object to attach event to
 * @argument evtype - name of the event - dont add "on", pass only "mouseover", etc
 * @argument fn - function to call
 */
function addevent(obj, evtype, fn){
 if (obj.addeventlistener){
    obj.addeventlistener(evtype, fn, false);
    return true;
 } else if (obj.attachevent){
    var r = obj.attachevent("on"+evtype, fn);
    return r;
 } else {
    return false;
 }
}
function removeevent(obj, evtype, fn, usecapture){
  if (obj.removeeventlistener){
    obj.removeeventlistener(evtype, fn, usecapture);
    return true;
  } else if (obj.detachevent){
    var r = obj.detachevent("on"+evtype, fn);
    return r;
  } else {
    alert("handler could not be removed");
  }
}

/**
 * code below taken from - http://www.evolt.org/article/document_body_doctype_switching_and_more/17/30655/
 *
 * modified 4/22/04 to work with opera/moz (by webmaster at subimage dot com)
 *
 * gets the full width/height because it's different for most browsers.
 */
function getviewportheight() {
	if (window.innerheight!=window.undefined) return window.innerheight;
	if (document.compatmode=='css1compat') return document.documentelement.clientheight;
	if (document.body) return document.body.clientheight; 

	return window.undefined; 
}
function getviewportwidth() {
	var offset = 17;
	var width = null;
	if (window.innerwidth!=window.undefined) return window.innerwidth; 
	if (document.compatmode=='css1compat') return document.documentelement.clientwidth; 
	if (document.body) return document.body.clientwidth; 
}

/**
 * gets the real scroll top
 */
function getscrolltop() {
	if (self.pageyoffset) // all except explorer
	{
		return self.pageyoffset;
	}
	else if (document.documentelement && document.documentelement.scrolltop)
		// explorer 6 strict
	{
		return document.documentelement.scrolltop;
	}
	else if (document.body) // all other explorers
	{
		return document.body.scrolltop;
	}
}
function getscrollleft() {
	if (self.pagexoffset) // all except explorer
	{
		return self.pagexoffset;
	}
	else if (document.documentelement && document.documentelement.scrollleft)
		// explorer 6 strict
	{
		return document.documentelement.scrollleft;
	}
	else if (document.body) // all other explorers
	{
		return document.body.scrollleft;
	}
}