//Help function
function showElement(el)
{
    if(el == null) return;
    el.style.visibility = 'visible';
    el.style.display = 'block';
}

function hideElement(el)
{
    if(el == null) return;
    el.style.visibility = 'hidden';
    el.style.display = 'none';
}

function shElement(el, show)
{
    if (show) {
        showElement(el);
    } else {
        hideElement(el);
    }    
}

function negateSHElement(el, defaultHidden)
{
  if( el == null) return;
  if( el.style.display == 'none' || ( el.style.display == '' && defaultHidden )) {
    showElement(el);
    } else {
        hideElement(el);
    }    
}

function switchTextAndNegateElement(evt, el, defaultHidden, vis, skjul)
{
 negateSHElement(document.getElementById(el), defaultHidden);
  var eventElement;
  eventElement = (evt.target == null ? evt.srcElement : evt.target );
  if( document.getElementById(el).style.display == 'none' ) eventElement.innerHTML = vis; else eventElement.innerHTML = skjul;

}

//Add multiple functions to the window.onload event.   
function addLoadEvent(func) {   
  var oldonload = window.onload;   
  if(typeof window.onload != 'function') {   
    window.onload = func;   
  } else {   
    window.onload = function() { oldonload(); func(); };   
  }   
}



/* Client-side access to querystring name=value pairs
	Version 1.2.4
	30 March 2008
	Adam Vandenberg
*/
function Querystring(qs) { // optionally pass a querystring to parse
	this.params = {};
	this.get=Querystring_get;
	
	if (qs == null);
		qs=location.search.substring(1,location.search.length);

	if (qs.length == 0) 
		return;

// Turn <plus> back to <space>
// See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
	qs = qs.replace(/\+/g, ' ');
	var args = qs.split('&'); // parse out name/value pairs separated via &
	
// split out each name=value pair
	for (var i=0;i<args.length;i++) {
		var pair = args[i].split('=');
		var name = unescape(pair[0]);
		
		var value = (pair.length==2)
			? unescape(pair[1])
			: name;
		
		this.params[name] = value;
	}
}

function Querystring_get(key, default_) {
	var value=this.params[key];
	return (value!=null) ? value : default_;
}