var undefined;
var isNS= false;
var isMacIE50= false;
var isIE = false;
var ua=navigator.userAgent;
if(ua.indexOf("Gecko")>=0) {
 window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN|Event.MOUSEMOVE|Event.RESIZE);
 isNS= true;
}

if( (ua.indexOf("MSIE 5.0")>=0) && (ua.indexOf("Mac")>=0)) {
// window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN|Event.MOUSEMOVE|Event.RESIZE);
 isMacIE50= true;
}

if( (ua.indexOf("MSIE 5.1")>=0) && (ua.indexOf("Mac")>=0)) {
// window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN|Event.MOUSEMOVE|Event.RESIZE);
 isMacIE50= true;
}

if( ua.indexOf("MSIE")>=0  ) {
// window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN|Event.MOUSEMOVE|Event.RESIZE);
 isIE= true;
}