var bv = navigator.appVersion.substring(0,1);
var mac = false;
var nc4 = false;
var ie4 = false;
var nc6 = false;
var nc4 = (document.layers)? true:false;
var ie4 = (document.all)? true:false;
var nc6 = (document.getElementById)? true:false;
if (ie4){
nc6=false;
}
if(navigator.userAgent.indexOf('Mac') != -1) {
if(nc6){
document.write('');
ie4=null;
}
if(nc4){
document.write('');
document.close();
}
if(ie4){
document.write('');
}
}else {
if(nc6){
document.write('');
ie4=null;
}
if(nc4){
document.write('');
}
if(ie4){
document.write('');
}
}