function showhide(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
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       else
          e.style.display = 'block';
    }
function afficheDeroul(){
	if (!document.getElementsByTagName) return false;
  	var lesDivs = document.getElementsByTagName("div");
  	for (var i=0; i < lesDivs.length; i++) {
    	if (lesDivs[i].className.match("contenu")) {
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    			document.getElementById("caDeroule").style.display = "block";
    			if(document.getElementsByTagName("body")[0].clientHeight > 572) {
    				var tailleHaut = (document.getElementsByTagName("body")[0].clientHeight / 2) - 285;
    				var hauteurTotale = document.getElementsByTagName("body")[0].clientHeight;
    				var padd = hauteurTotale - tailleHaut - 502;
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    		}
    	}
    }
}
var defil = true;
function descend() {
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	baisse();
}
function baisse() {
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		window.scrollBy(0, 2);
		setTimeout('baisse()',10);
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}
function monte() {
	defil = true;
	remonte();
}
function remonte() {
	if(defil){
		window.scrollBy(0, -2);
		setTimeout('remonte()',10);
	}
}

function stopDefil() {
	defil = false;	
}
function init() {
	afficheDeroul();
}
window.onload = init;