function $(elementId)
{
	return(document.getElementById(elementId));
}

function el_show(elementId)
{
	var element = $(elementId);
	
	if (typeof(element.style) != "undefined")
	{
		element.style.display = "block";
		element.style.visibility = "visible";
	}
}

function el_hide(elementId)
{
	var element = $(elementId);
	
	if (typeof(element.style) != "undefined")
	{
		element.style.display = "none";
		element.style.visibility = "hidden";
	}
}

function el_update(elementId, text)
{
	var element = $(elementId);
	
	if (typeof(element.innerHTML) != "undefined")
	{
		element.innerHTML = text;
	}
}

function el_new_id(elementId, elementNewId)
{
	var element = $(elementId);
	
	if (typeof(element.id) != "undefined")
	{
		element.id = elementNewId;
	}
}

function img_src(image, newsrc)
{
	var img = document[image];
	
	if (typeof(img.src) != "undefined")
	{
		img.src = newsrc;
	}
}

function pop_window(mypage, myname, w, h, props) {

	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+','+props
	win = window.open(mypage, myname, winprops)
	
	if (parseInt(navigator.appVersion) >= 4) { 
		win.window.focus(); 
	}
	
	return(win);
	
}

function do_check_uncheck(field, value)
{
	if (value == true)
	{
		check_all(field);
	}
	else
	{
		uncheck_all(field);
	}
}

function check_all(field)
{
	if (typeof(field.length) == 'undefined')
	{
		field.checked = true;
	}
	else
	{
		for(i = 0; i < field.length; i++)
		{
			field[i].checked = true;
		}
	}
}

function uncheck_all(field)
{
	if (typeof(field.length) == 'undefined')
	{
		field.checked = false;
	}
	else
	{
		for(i = 0; i < field.length; i++)
		{
			field[i].checked = false;
		}
	}
}

function empty_select(field)
{
	var length = field.length;
	
	for (i = 0; i < length; i++)
	{
		field.options[0] = null;
	}
}

function add_option(field, text, value, selected)
{
	if (selected)
	{
		field.options.add(new Option(text, value, true, true));
	}
	else
	{
		field.options.add(new Option(text, value));
	}
}

function radio_hook(field, eventfunction)
{
	for(i = 0; i < field.length; i++)
	{
		field[i].onclick = eventfunction;
	}
}

function radio_value(field)
{
	for(i = 0; i < field.length; i++)
	{
		if (field[i].checked)
		{
			return(field[i].value);
		}
	}
	
	return('');
}

function switchlang()
{
	var currentpage = document.location.href;
	
	
//	currentpage = currentpage.toLowerCase();
	
	var position = currentpage.indexOf('lang=');
	
	if (position == -1)
	{
		if (currentpage.indexOf('?') != -1)
		{
			document.location = currentpage + '&lang=en';
		}
		else
		{
			document.location = currentpage + '?lang=en';
		}
	}
	else
	{
		var lang = currentpage.substr(position + 5, 2);	
		var newlocation = currentpage.substr(0, position + 5);
		
		if (lang == 'fr')
		{
			newlocation += 'en' + currentpage.substr(position + 7);
		}
		else
		{
			newlocation += 'fr' + currentpage.substr(position + 7);
		}
		
		document.location = newlocation;
	}
	
}

function validate_captcha(hash, value)
{
	makePostRequest('captcha.php',  'hash=' + escape(hash) + '&value=' + escape(value), 'validate_captcha_handler');
}

function validate_captcha_handler()
{
	if (http_request.readyState == 4)
	{
		if (http_request.status == 200)
		{
			var response = http_request.responseXML.documentElement;
			var valid = response.getElementsByTagName('valid')[0].firstChild.data;
			
			if (Number(valid) == 1)
			{
				// captcha is valid
				captcha_validator(true);
			}
			else
			{
				// captcha is invalid
				captcha_validator(false);
			}
		}
	}
}

function generate_captcha()
{
	makePostRequest('captcha.php?action=generate',  '', 'generate_captcha_handler');
}

function generate_captcha_handler()
{
	if (http_request.readyState == 4)
	{
		if (http_request.status == 200)
		{
			var response = http_request.responseXML.documentElement;
			var newhash = response.getElementsByTagName('hash')[0].firstChild.data;
			
			captcha_reload(newhash);
		}
	}
}


function recherche_top()
{
	var currentpage = document.location.href.toLowerCase();
	var longueur = currentpage.length;
	var where_is=currentpage.indexOf('q=')+2;
	var longueur = longueur - where_is;
	var extraction = currentpage.substr(where_is,longueur);
	for (var x = 1; x <= 6; x++) {
		var extraction = extraction.replace("+"," ");
				}
	if (where_is!=-1) document.getElementById('q').value = decodeURIComponent(extraction);
	/*
	if (extraction.indexOf('%')!=-1) return false;
	else if (where_is!=-1) document.getElementById('q').value = extraction;
	*/
}