/* formulaire Imc */
function imc(taille,poids)
{
  var calc=0;

  {
    calc = parseFloat(poids) ;
    calc = calc / (parseFloat(taille)*parseFloat(taille)) ;
  }

  return calc;
}

function disp_alert()
{

	var t= document.getElementById("taille").value;
	t = parseFloat(t) / parseFloat(100);
	var p= document.getElementById("poids").value;

	var masse = parseFloat(imc (t,p)) ;

	var masse_dec = masse.toFixed(3) ;

	champ_num(masse_dec) ;
}



function champ_num(valeur) {
  
  var resfield=document.getElementById("resultat");

	if (isNaN(valeur)) 
		resfield.value = "..."; 
	else
		resfield.value = valeur ;
}


/* changement css */
function setActiveCSS(cssFile) {
	var i, links, main;
	for (i=0; (links = document.getElementsByTagName("link")[i]); i++) {
		if (links.getAttribute("rel") && links.getAttribute("rel").indexOf("stylesheet") != -1 && links.getAttribute("title")) {
			links.disabled = true;
			// disabled all -> enable one
			if (links.getAttribute("title") == cssFile) {
				links.disabled = false;
			} 
		} 
	} 
}

function getActiveCSS() {
	var i, links; 
	for (i=0; (links = document.getElementsByTagName("link")[i]); i++) {
		if (links.getAttribute("rel") && links.getAttribute("rel").indexOf("stylesheet") != -1 && links.getAttribute("title") && links.disabled == false) { 
			return links.getAttribute("title");
		}
	} 
	return null; 
}

function getDefaultCSS() { 

	var i, links; 
	for (i=0; (links = document.getElementsByTagName("link")[i]); i++) { 
		if (links.getAttribute("rel") && links.getAttribute("rel").indexOf("stylesheet") != -1 && links.getAttribute("rel").indexOf("alternate") == -1 && links.getAttribute("title") ) {
		return links.getAttribute("title"); 
		}
	} 
	return null; 
}

function img_bandeau()
{
		var nb=Math.floor(Math.random(7)*6); // 0.999 maxi x 9 = 8.9999 donc nb max 8 
		var page=document.getElementById("page");
		var tab = new Array();
		tab[0] = "maladie";
		tab[1] = "prevention";
		tab[2] = "temoignage";
		tab[3] = "plan";
		tab[4] = "contact";
		tab[5] = "idees";
		tab[6] = "liens";

		page.className=tab[nb];
}


var clicked = false;
function init_field(obj) 
{ 
	if (!clicked) 
	{ 
		obj.value = ""; 
		clicked = true;
		return true; 
	} 
	return false; 
}