document.observe('dom:loaded',function(){
	$$('input.form_number').each(function(el){
		el.observe('keypress',function(e){
			var code = e.which || e.keyCode;
			if (code != 0 && code != 8 && code != 9 && code != 37 && code != 39 && !String.fromCharCode(code).match(/[0-9,.]/)) {
				e.stop();
			}
		});
	});
});

function checkNumber(value){
	return value.match(/^[0-9]+((,|.)[0-9]+)?$/);
}