function validate_form(thisForm) {
    var err="";
    with (thisForm) {
        if (name.value=="" || name.value==null) {
            err+="- You must enter your name.\n";
            }
        if (email.value=="" || email.value==null) {
            err+="- You must enter your email address.\n";
            }
        if (message.value=="" || message.value==null) {
            err+="- You must enter a message.\n";
            }
        if (captcha.value=="" || captcha.value==null) {
            err+="- You must enter the security number shown.\n";
            }
        }
    if (err!="") {
        alert("Please correct the following errors and try again\n"+err);
        return false;
        }
    else {
        return true;
        }
    }