window.onload = function() {
setFooter();
}
window.onresize = function() {
setFooter();
}

function setFooter() {
    if (document.getElementById) {
        var windowHeight=getWindowHeight();
        if (windowHeight>0) {
            var contentHeight=document.getElementById('home_presentation').offsetHeight;
            var footerElement=document.getElementById('footer');
            var footerHeight=footerElement.offsetHeight;
            var nav = document.getElementById('home_nav_gauche');
        //if (windowHeight-(contentHeight+footerHeight)>=0) {
        if(800 >= contentHeight){
            //footerElement.style.position='relative';
            //footerElement.style.top=(windowHeight-(contentHeight+footerHeight))+'px';
        }
        else {
            //footerElement.style.position='static';
            //nav.style.height=windowHeight; 
            nav.style.height=contentHeight+'px';
            /*
            if(document.getElementById('zone_meteo')){
                var suppHeight = document.getElementById('zone_meteo').offsetHeight;
                var hauteur = contentHeight + suppHeight;
                //alert(hauteur); 
                nav.style.height = hauteur+'px';
            } */
            //alert('Taille : '+contentHeight);
        }
       }
      }
}

function getWindowHeight() {
    var windowHeight=0;
    if (typeof(window.innerHeight)=='number') {
        windowHeight=window.innerHeight;
    }
    else {
     if (document.documentElement&&
       document.documentElement.clientHeight) {
         windowHeight = document.documentElement.clientHeight;
    }
    else {
     if (document.body&&document.body.clientHeight) {
         windowHeight=document.body.clientHeight;
      }
     }
    }
    return windowHeight;
}