function montre(id) {

if (document.getElementById && document.getElementById(id)) {
                  document.getElementById(id).style.visibility="visible";
                } else if (document.all) {
                  document.all[id].style.visibility="visible";
                } else if (document.layers) {
                  document.layers[id].visibility="visible";
                } } 
                
                
 function cache(id) {
          if (document.getElementById && document.getElementById(id)) {
                  document.getElementById(id).style.visibility="hidden";
                } else if (document.all) {
                  document.all[id].style.visibility="hidden";
                } else if (document.layers) {
                  document.layers[id].visibility="hidden";
                } } 

 function changecolor(id, color) {
          if (document.getElementById) {
                  document.getElementById(id).style.color=color;
                } else if (document.all) {
                  document.all[id].style.color=color;
                } else if (document.layers) {
                  document.layers[id].color=color;
                } } 
				

				
 function changeclass(id, classnom) {
          if (document.getElementById) {
                  document.getElementById(id).className=classnom;
                } else if (document.all) {
                  document.all[id].className=classnom;
                } else if (document.layers) {
                  document.layers[id].className=classnom;
                } } 



function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}


 function openwindowscenter(page, largeur, hauteur, opt) 
{ 
var top=(screen.height-hauteur)/2;
var left=(screen.width-largeur)/2;
window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+opt);
}