function enterContents(file){
  if ( navigator.appName && navigator.appName.indexOf("Microsoft") != -1 &&
       navigator.userAgent.indexOf("Windows") != -1 &&
       navigator.userAgent.indexOf("Windows 3.1") == -1
     ){ 
       window.open(file,"contents","fullscreen=1");
     } else {
       var diplayWidth = screen.availWidth;
       var diplayHeight = screen.availHeight;
       var optionString = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,";
       optionString += "width="+diplayWidth+",height="+diplayHeight+",left="+0+",top="+0;
       window.open(file,"contents",optionString);
     }
}