// Pop up
function PopUp (myUrl, W, H, param) {
	var top = (screen.height-H)/2;     
	var left = (screen.width-W)/2;
	
	if(param == undefined) {   // pas de scroll par défaut
      var param = 'scrollbars=no, resizable=no, status=no';
  }
  
	newWin = window.open(myUrl,'newPop','top='+top+', left='+left+', width='+W+',height='+H+','+ param);
	newWin.focus();
}