function isNumber(value)
{
	var reg = /[+,1]?\d+$/;
	return reg.test(value);
}

function isNull(value)
{
	return(value.replace(/(^\s*)|(\s*$)/g,"")) == "";
}

function checkLength(value)
{
	return value.replace(/[^\x00-\xff]/g,"**").length;
}