function roll_over(img_name, img_src){   
   document.getElementById(img_name).src = img_src;
}
function bustIt(theURL,winName,features){
  window.open(theURL,winName,features);
}

function validateForm(form) {
    var status = true;
    var i = 0;
    var errors = new Array();
    
    // Check that a last name was entered
    if (form.name.value == "") {
        errors[i++]= "Name is a required field.";
        status = false;
    }
    
    if (form.email.value == "") {
        errors[i++]= "Email is a required field.";
        status = false;
    }
    
    if (form.feedback.value == "") {
        errors[i++]= "Feedback is a required field.";
        status = false;
    }
    
    
    // Show errors messages, if any
    if (status == false) {
        var msg = "";
        for (var i=0; i<errors.length; i++) {
            msg = msg + "\n" + errors[i];
        }
        alert(msg);
        return false;
    } else {
        return true;
    }
}