function checkForm(btnSubmit){
    var errorMessage = "";

    var elementsForms = btnSubmit.form.getElementsByTagName("input");


    for (var intCounter = 0; intCounter < elementsForms.length; intCounter++) {

        if (elementsForms[intCounter].required != undefined) {
            if (elementsForms[intCounter].value == "") {
                errorMessage += "\n  - " + elementsForms[intCounter].required;
               
            }
        }

    }

    elementsForms = btnSubmit.form.getElementsByTagName("textarea");


    for (var intCounter = 0; intCounter < elementsForms.length; intCounter++) {

        if (elementsForms[intCounter].required != undefined) {
            if (elementsForms[intCounter].value == "") {
                errorMessage += "\n  - " + elementsForms[intCounter].required;

            }
        }

    }

    if (errorMessage != "") {
        alert("The following fields are required:" + errorMessage);
        return false;
    }

    return true;
}