// JavaScript Document



// validates that the field value string has one or more characters in it

function isEmpty(elem) {

    var str = elem;

    var re = /.+/;

    if(!str.match(re)) {

         return true;

    } else {

        return false;

    }

}

   

//validates that the entry is a positive or negative number

function isNumber(elem) {

    var str = elem;

    var re = /^[-]?\d*\.?\d*$/;

    str = str.toString( );

    if (!str.match(re)) {

        alert("Enter only numbers into the field.");

        return false;

    }

    return true;

}

   

// validates that the entry is 16 characters long when

// input field's maxlength attribute is set to 16

function isLen16(elem) {

    var str = elem;

    var re = /\b.{16}\b/;

    if (!str.match(re)) {

        alert("Entry does not contain the required 16 characters.");

        return false;

    } else {

        return true;

    }

}

   

// validates that the entry is formatted as an email address

function isEMailAddr(elem) {

    var str = elem;

    var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;

    if (!str.match(re)) {

        return false;

    } else {

        return true;

    }

}