Block shortcuts in Web pages-hacker nature

Copy Code code as follows:

<script language= "Javascript" >
Screen the right mouse button, CTRL + N, SHIFT+F10, F5 refresh, backspace key
Shielding F1 Help
function Window.onhelp ()
{
return False
}
function KeyDown ()
{
alert (Event.keycode);
Shielding ALT + Direction key ← Screen Alt + Direction key →
if ((Window.event.altKey) && ((window.event.keycode==37) | | (window.event.keycode==39)))
{
Alert ("You are not allowed to use ALT + arrow keys forward or back page!") ");
Event.returnvalue=false;
}
Mask backspace Delete key, mask F5 refresh key, Ctrl + R
if ((event.keycode==116) | | (Event.ctrlkey && event.keycode==82))
{
event.keycode=0;
Event.returnvalue=false;
}
Block CTRL + N
if ((Event.ctrlkey) && (event.keycode==78)
{
Event.returnvalue=false;
}
Shielding SHIFT+F10
if ((Event.shiftkey) && (event.keycode==121)
{
Event.returnvalue=false;
}
Screen shift plus left mouse button new page open
if (Window.event.srcElement.tagName = "A" && Window.event.shiftKey)
{
Window.event.returnValue = false;
}
Shielding Alt+f4
if ((Window.event.altKey) && (window.event.keycode==115)
{
Window.showmodelessdialog ("About:blank", "" "," dialogwidth:1px;dialogheight:1px ");
return false;
}
Block CTRL + A
if ((Event.ctrlkey) && (event.keycode==65)
{
return false;
}
}
</script>