function hide_div(id_to_hide)
{
	document.getElementById(id_to_hide).style.display = 'none';
}

function show_div(id_to_show, evt, align_vertical, align_horiz)
{
	var element = document.getElementById(id_to_show);
	if (element)
	{
		if ( (element.style.display == '') || (element.style.display == 'none'))
		{
			element.style.display = 'block';

			// trouve la hauteur de l'élément
			var hauteur = element.offsetHeight;
			var largeur = element.offsetWidth;

			bulle(id_to_show, evt, largeur, hauteur, align_vertical, align_horiz);
		}
		else
		{
			hide_div(id_to_show);
		}
	}
	else
	{
		alert("show_div : id introuvable ["+id_to_show+"]");
	}

}

var bulleStyle=null
if (!document.layers && !document.all && !document.getElementById)
   event="chut";  //pour apaiser NN3 et autres antiquites

function bulle(id_to_show, evt, width_element, height_element, align_vertical, align_horiz)
{
	var xfenetre,yfenetre,xpage,ypage,element=null;
	var xpopup,ypopup=null;

	var align_v = parseInt(align_vertical);
	if (!align_v)
		var align_v = "center"; // top / bottom
	var align_h = parseInt(align_horiz);
	if (!align_h)
		var align_h = "center"; // left / right

	var offset= 5;           // decalage par rapport au curseur de souris par defaut

	var bulleWidth=parseInt(width_element);
	if (height_element)
		var hauteur=parseInt(height_element);
	else
		var hauteur=200; // defaut

	var haut_ecran = f_clientHeight();
	var larg_ecran = f_clientWidth();

	var element = document.getElementById(id_to_show);

	if ( (evt == null) || !(document.getElementById) )
	{
		// alignement dans l'écran
		switch(align_v)
		{
			case "top":
			{
				ypopup = 10;
			}
			break;
			case "bottom":
			{
				ypopup = (haut_ecran - height_element - 10);
			}
			break;
			case "center":
			{
				ypopup = (haut_ecran - height_element) / 2;
			}
			break;
		}

		switch(align_h)
		{
			case "left":
			{
				xpopup = 10;
			}
			break;
			case "right":
			{
				xpopup = (larg_ecran - width_element - 10);
			}
			break;
			case "center":
			{
				xpopup = (larg_ecran - width_element) / 2;
			}
			break;
		}
	}
	else
	{
		// alignement par rapport à la souris

		if (document.getElementById)
		{
			xpopup = evt.clientX;
			ypopup = evt.clientY;

			// cale le popup à gauche de la souris si trop large par rapport à l'écran
			if ( (evt.clientX + offset + bulleWidth) > larg_ecran)
			{
				// cale à gauche
				xpopup = xpopup - bulleWidth - offset;
				// si sort de l'écran ==> revient au bord
				if (xpopup < 0)
					xpopup = offset;
			}
			else
			{
				// cale à droite de la souris
				xpopup = xpopup + offset;
			}

			// cale le popup au dessus de la souris si trop haut par rapport au bas de l'écran
			if ( (evt.clientY + offset + hauteur) > haut_ecran)
			{
				// cale en haut
				ypopup = ypopup - hauteur - offset;
				// si sort de l'écran ==> revient au bord
				if (ypopup < 0)
					ypopup = offset;
			}
			else
			{
				// cale au dessous
				ypopup = ypopup + offset;
			}
		}
	}

	if(element)
	{
		bulleStyle=element.style;
	}

	if(bulleStyle)
	{
		// ajustement avec scroll
		xpopup = xpopup + f_scrollLeft();
		ypopup = ypopup + f_scrollTop();

		// applique le style
		var bulleStyle=element.style;

		if(typeof(bulleStyle.left)=='string')
		{
			bulleStyle.left=xpopup+'px';
			bulleStyle.top=ypopup+'px';
		}
		else
		{
			bulleStyle.left=xpopup;
			bulleStyle.top=ypopup;
		}
	}
}


<!-- ================== fin du script de bulle d'aide ============== -->

function f_clientWidth() {
	return f_filterResults (
		window.innerWidth ? window.innerWidth : 0,
		document.documentElement ? document.documentElement.clientWidth : 0,
		document.body ? document.body.clientWidth : 0
	);
}
function f_clientHeight() {
	return f_filterResults (
		window.innerHeight ? window.innerHeight : 0,
		document.documentElement ? document.documentElement.clientHeight : 0,
		document.body ? document.body.clientHeight : 0
	);
}
function f_scrollLeft() {
	return f_filterResults (
		window.pageXOffset ? window.pageXOffset : 0,
		document.documentElement ? document.documentElement.scrollLeft : 0,
		document.body ? document.body.scrollLeft : 0
	);
}
function f_scrollTop() {
	return f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
}
function f_filterResults(n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
		n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}

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