mus over window_open

hvor er det lige at jeg har lavet en fejl
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>Ny side 2</title>
<SCRIPT Language=Javascript>


function window_open(pagina,titulo,ancho,largo,x,y){

  var Ventana= 'toolbar=0,location=0,directories=0,scrollbars=1,screenX='+x+',screenY='+y+',status=0,menubar=0,resizable=0,width='+ancho+',height='+largo;
  open(pagina,titulo,Ventana);

}
</SCRIPT>

</head>

<body><IMG SRC="images/1lille.jpg" BORDER=0 onMouseOver="overlib('<center><img src=C:/reneweb/images/1stor.jpg width=100></center>')" onMouseOut="nd()">

</body>

</html>