Bloquear la tecla Backspace.

[makeitslow]

Gracias NANO!! El codigo quedo asi y funciona de pelos:

<SCRIPT LANGUAGE="JavaScript">
function getKey(keyStroke) {
isNetscape=(document.layers);
eventChooser = (isNetscape) ? keyStroke.which : event.keyCode;
if (eventChooser==13) {
return false;
}
}
document.onkeypress = getKey;

document.onkeydown = function(){
if(window.event && window.event.keyCode == 116)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 505)
{
return false;
}
}

</script>