function closeCurrWindow(){    var browserName=navigator.appName;    alert(browserName);    if (browserName=="Netscape") {        window.open('','_self','');        window.close();     } else if (browserName=="Microsoft Internet Explorer") {                window.opener = "whoCares";                window.opener = null;    //Close window, not hint. for IE6, IE7                window.open('','_top'); //Close window, not hint. for IE7                window.close();            }}