// JavaScript Document
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;
}


function setTaille() {
        var windowHeight=getWindowHeight();
        if (windowHeight>0) {
		
            var headerElement=document.getElementById('header');
			var centerElement=document.getElementById('contenu');
			var footerElement=document.getElementById('footer');
			
			var headerHeight=headerElement.offsetHeight;
			var footerHeight=footerElement.offsetHeight;
			var centerHeight=centerElement.offsetHeight;
			
			// on recadre le tout que si le contenu est plus petit que la fenetre
			if ((centerHeight+footerHeight+ headerHeight)<windowHeight)	{
			centerElement.style.height= (windowHeight-headerHeight-footerHeight)+'px';
			}
       }
}