/*!
 * author:Kamalesh Adhikary
 * Date: 13.02.2011
 */
function keyRestrict(e, validchars) {
	 var key='', keychar='';
	 key = getKeyCode(e);
	 if (key == null) return true;
	 keychar = String.fromCharCode(key);
	 keychar = keychar.toLowerCase();
	 validchars = validchars.toLowerCase();
	 if (validchars.indexOf(keychar) != -1)
	  return true;
	 if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
	  return true;
	 return false;
}
function getKeyCode(e) {
	 if (window.event)
		return window.event.keyCode;
	 else if (e)
		return e.which;
	 else
		return null;
}