var win= null;
function popupVenster(mypage,myname,w,h,scroll) {
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  var settings ='height='+h+',';
	  settings +='width='+w+',';
	  settings +='top='+wint+',';
	  settings +='left='+winl+',';
	  settings +='scrollbars='+scroll+',';
	  settings +='resizable=no';
	  win = window.open(mypage,myname,settings);

if(parseInt(navigator.appVersion) >= 4){
  win.window.focus();
  }
} 

function MM_openBrWindow(theURL,winName,features) { 
  window.open(theURL,winName,features);
}