Dear Friend,
Identify the Back Keys, key event and disable the same.
Here I have give a sample code to display the F5 key.
document.onkeydown = function(e) {
if (e.keyCode === 116) {
return false;
}
if (e.keyCode === 8) {
return false;
}
};
If you want to hide the back button from the browser, then you can hide toolbar by calling the child window.
EG:
newwindow=window.open(url,'','toolbar=no,location=no,menubar=no,scrollbars=yes');