function $( id ) {
	try{
		return document.getElementById( id );
	} catch( e ) {
		return null;
	}
}

function click_clear( evt, f, id ) {
	/*var o = $(id);
	  if ( o )
	  o.value = "";*/
	var frm = document.forms[ f ];
	if ( frm ) {
		var o = frm[ id ];
		if ( o ) 
			o.value = "";
	}
}

var show_licence_first_time = true;
function show_licence( id ) {
	if ( show_licence_first_time ) {
		var fct = function( contenu ) {
			var d = $('id1').innerHTML = contenu;	
		}
		getUrl( "licence.php", fct );
	}

	centerPopup( 'div_licence' );

	var div = $('div_licence');
	div.style.display = "block";

	var url = $('href_licence_accept');
	url.href = "download.php?tag=" + id;
	return false;
}

function hide_licence( r ) {
	$('div_licence').style.display='none';
	return r;
}

function show_alert() {
	//centerPopup( 'div_droit' );
	var d = $('div_droit' );
	//div.style.display = 'block';
	d.style.display='block';	
	d.style.top = "80px";
	d.style.left = (window.screen.availWidth - d.offsetWidth)/2 + "px";
	return false;
}

function hide_alert() {
	$('div_droit').style.display='none';
	return false;
}

function centerPopup(element) {
	var el = $(element);
	var height= 400;// el.offsetHeight;//hauteur de l'élément à positionner
	var width= 500; //el.offsetWidth;//largeur de l'élément à positionner
	var myParent=el.parentNode;
	var pHeight=myParent.offsetHeight;//Hauteur de l'élément parent
	var pWidth=myParent.offsetWidth;//Largeur de l'élément parent
	var sTop=myParent.scrollTop;//Hauteur de défilement de l'élément parent
	var sLeft=myParent.scrollLeft;//Longueur de défilement de l'élément parent
	var posY=(pHeight/2)-(height/2)+sTop;//Calcul de la position en Y
	var posX=(pWidth/2)-(width/2)+sLeft;//Calcul de la position en X
	el.style.top=posY+"px";
	el.style.left=posX+"px";
}

function js_login_show( evt ) {
	var d = $('id_div_login');
	if ( d ) {
		d.style.display='block';	
		d.style.top = "80px";
		d.style.left = (window.screen.availWidth - d.offsetWidth)/2 + "px";
	}
	return false;
}

function js_login_hide( evt ) {
	var d = $('id_div_login');
	if ( d ) {
		d.style.display='none';
	}
}

function js_product( evt ) {

	js_login_show( evt );
}