/**
 * File: Utility.js
 * Author: Brian Borowski
 * Date created: November 15, 2002
 * Date last modified: February 12, 2011
 */

/**
 * Returns true if the string contains only numeric characters and false
 * otherwise.
 */
function isOnlyNumeric(string) {
    var invalidCharactersRegExp = /[^\d]/;
    var isValid = !(invalidCharactersRegExp.test(string));
    return isValid;
}

/**
 * Returns the string with leading and trailing whitespace removed.
 */
function trim(string) {
    return string.replace(/(?:(?:^|\n)\s+|\s+(?:$|\n))/g, "");
}

/**
 * Sets the cursor to be of type cursorType. Valid inputs are "auto" and
 * "wait".
 */
function setCursor(cursorType) {
    // Use regular expressions to get Mozilla-based browsers to change the
    // cursor back to the default cursor for all document elements.
    // Any element where the 'hand' cursor is desired must include the 'id'
    // attribute, and its value must begin with 'link'.
    var bodyAll;
    var linkRegExp = /link*./;
    if (document.body && document.body.all) {
        bodyAll = document.body.all;
    } else if (document.body && document.body.getElementsByTagName) {
        bodyAll = document.body.getElementsByTagName('*');
    }
    if (bodyAll) {
        for (var i = 0; i < bodyAll.length; i++) {
            if (linkRegExp.test(bodyAll[i].id)) {
                bodyAll[i].style.cursor = 'pointer';
            } else {
                bodyAll[i].style.cursor = cursorType;
            }
        }
    }
}