function getElem(id) { return document.getElementById(id); }
function getValue(id) { return getElem(id).value; }
function hasBeenFilled(text) { return (text.length > 0); }

function initLightBox() {
	var objBody = document.getElementsByTagName("body").item(0);
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id', 'overlay');
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '1';
 	objOverlay.style.width = '100%';
	objOverlay.style.height = '2000px'; //dd.getScrollY()+dd.getWndH()+'px';
	objBody.insertBefore(objOverlay, objBody.firstChild);
}

function showLightbox() {
	getElem('overlay').style.display = 'block';
}

function closeLightBox() {
	getElem('overlay').style.display = 'none';
}

function showDescription(code) {
	xhr_object = ajax(BasePath + "/achievement/ajax_description.php?code=" + code);
	if (xhr_object.readyState == 4)
		dd.elements.popup_window.write(xhr_object.responseText);

	dd.elements.popup_window.moveTo(dd.getWndW() / 2 - 300, 20+dd.getScrollY()/*+dd.getWndH() / 2 - 450*/);
	dd.elements.popup_window.show();
}
function popout() {
	dd.elements.popup_window.hide();
}

function checkForm(formName) { 	
	form = eval('document.' + formName);
	for(i = 0; i < form.elements.length; ++i) {
		if (!hasBeenFilled(form.elements[i].value))  {
			alert('Vous devez remplir ce champ !');
			form.elements[i].focus();
			return false;
		}
	}
	return true;
}

function number_format (number, decimals, dec_point, thousands_sep) {
	var exponent = "";
	var numberstr = number.toString ();
	var eindex = numberstr.indexOf ("e");
	if (eindex > -1) {
		exponent = numberstr.substring (eindex);
		number = parseFloat (numberstr.substring (0, eindex));
	}
	
	if (decimals != null) {
		var temp = Math.pow (10, decimals);
		number = Math.round (number * temp) / temp;
	}
	var sign = number < 0 ? "-" : "";
	var integer = (number > 0 ? 
	Math.floor (number) : Math.abs (Math.ceil (number))).toString ();
	
	var fractional = number.toString ().substring (integer.length + sign.length);
	dec_point = dec_point != null ? dec_point : ".";
	fractional = decimals != null && decimals > 0 || fractional.length > 1 ? (dec_point + fractional.substring (1)) : "";
	if (decimals != null && decimals > 0) {
		for (i = fractional.length - 1, z = decimals; i < z; ++i)
			fractional += "0";
	}
	
	thousands_sep = (thousands_sep != dec_point || fractional.length == 0) ? 
	thousands_sep : null;
	if (thousands_sep != null && thousands_sep != "") {
		for (i = integer.length - 3; i > 0; i -= 3)
			integer = integer.substring (0 , i) + thousands_sep + integer.substring (i);
	}
	
	return sign + integer + fractional + exponent;
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if (node == null) node = document;
	if (tag == null) tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}


function setVisibility(id, visible) {
	getElem(id).style.visibility = (visible ? 'visible' : 'hidden');
	getElem(id).style.display = (visible ? 'block' : 'none');
}
function changeVisibility(id) {
	setVisibility(id, !isVisible(id));
}
function isVisible(id) {
	return (getElem(id).style.visibility != 'hidden');
}

function ajax(url) {
	var xhr_object = null;
	if (window.XMLHttpRequest) var xhr_object = new XMLHttpRequest();
	else if (window.ActiveXObject) var xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
	xhr_object.open("GET", url, false);   
	xhr_object.send(null);
	return xhr_object;
}