var win=null;
function Pop(mypage)
   {
	  var w = screen.availWidth;
		var h = screen.availHeight;
		var myname = 'Paiement';
		var pos = 'center';
    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=yes,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
    win=window.open(mypage,myname,settings);
	 }