var allowBS =0;
var IsTextArea = 0;
document.onkeydown = function(){
	//check for function keys F12 key is not handled as it is not intented to do anything.
	if(window.event.keyCode > 112 && window.event.keyCode < 123){
		//window.event.keyCode = 000;
		//return false;
	}
	//check for  SHIFT / ALT / CTL keys
	else if(window.event.keyCode > 15 && window.event.keyCode < 20){
		return false;
	}
	 else if(window.event.keyCode == 8){
            if (allowBS==0){
            return false;
            }
      }
}