function close_win(){
var nvua = navigator.userAgent;
if(nvua.indexOf('MSIE') >= 0){
if(nvua.indexOf('MSIE 5.0') == -1) {
top.opener = '';
}
}
else if(nvua.indexOf('Gecko') >= 0){
top.name = 'CLOSE_WINDOW';
wid = window.open('','CLOSE_WINDOW');
}
top.close();
}