function validateEmail(address) {
    var reg = /^([A-Za-z0-9_\'\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
    return (reg.test(address)) ? true : false;
}

function maxChar(maxlength, txtbox) {
    if (txtbox.value.length > (maxlength - 1)) {
        txtbox.value = txtbox.value.substring(0, maxlength);
    }
}

function trim(stringToTrim) {
    return stringToTrim.replace(/^\s+|\s+$/g, "");
}

function isNumberKey(evt){
    var key = (window.event) ? event.keyCode : evt.which;
    if (key > 31 && (key < 48 || key > 57))
        return false;
    else
        return true;
}