function open_w(url, name, width, height, param) {
  
    var ah = screen.availHeight;
    var aw = screen.availWidth;

	var str = param + ",height=" + height + ",innerHeight=" + height;
  	str += ",width=" + width + ",innerWidth=" + width;
	
    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;

	window.open(url, name, str);
}
function open_carnet(url)
 {
    var ah = screen.availHeight;
    var aw = screen.availWidth;

 var height = 370;
 var width =  770;

 var str = "scrollbars=no,resizable=no,menubar=no,status=no," +
"height=" + height + ",innerHeight=" + height;
   str += ",width=" + width + ",innerWidth=" + width;

    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;

 window.open(url, 'new4', str);
 }// JavaScript Document