function block_chars(e)
{
	var key = window.event?e.keyCode:e.which;
	var keychar = String.fromCharCode(key);
	reg = /\d/;
	return reg.test(keychar) || key == 8 || key == 0;
}

function block_en_chars(e)
{
	var key = window.event?e.keyCode:e.which;
	var keychar = String.fromCharCode(key);
	var reg = /[0-9à-ÿÀ-߸¨]{1}/;
	return reg.test(keychar) || key == 8 || key == 9 || key == 0;
}