var win = null;

function changepage()  {

	if ((win != null) && !(win.closed)) { win.close(); }

}


function fenetre(mypage,myname,w,h,scroll,no,statusbar,menubar,toolbar)
{
  LeftPosition = (screen.width) ? (screen.width-w)/2 : 524;
TopPosition = (screen.height) ? (screen.height-h)/2 : 128;
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable='+no+' ,status=' + statusbar + ' ,menubar=' + menubar + ' ,toolbar=' + toolbar + '';
if ((win != null) && !(win.closed)) { win.close(); }
win = window.open(mypage,myname,settings);

if (win.window.focus) {win.window.focus();}



}