//......................
function getKeyCode(e)
		{
			if (window.event)
			return window.event.keyCode;
			else if (e)
			return e.which;
			else
			return null;
		}
		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;
		}