function popup(url, titre, largeur, hauteur)
  {
  var ns4 = (document.layers)? true:false;     //NS 4
  var ie4 = (document.all)? true:false;	     //IE 4
  var dom = (document.getElementById)? true:false;	  //DOM
  var xMax, yMax, xOffset, yOffset;;	  

  if (ie4 || dom)
    {
    xMax = screen.width;
    yMax = screen.height;
  } 
  else if (ns4)
    {
    xMax = window.outerWidth;
    yMax = window.outerHeight;
    } 
  else
      {
      xMax = 800;
      yMax = 600;
      }
  xOffset = (xMax - largeur)/2;
  yOffset = (yMax - hauteur)/2;
   window.open (url, titre, "height=" + hauteur + ", width=" + largeur + ", screenX=" + xOffset + ", screenY=" + yOffset + "toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, directories=no, status=no");
  }
  
function ouvreFenetre(mypage,myname,w,h,scroll,pos){
	if(pos=="random"){LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}
	if(pos=="center"){LeftPosition=(screen.width)?(screen.width-w)/2:100;TopPosition=(screen.height)?(screen.height-h)/2:100;}
	else if((pos!="center" && pos!="random") || pos==null){LeftPosition=0;TopPosition=20}
	settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
	win=window.open(mypage,myname,settings);
}

/** Confirmation d'une action **/
function confirmation(url,endmsg) {
	res = confirm(endmsg);
	if(res) document.location.href = url;
}