function check(id) {
	c = document.getElementById(id);
	if (c.type == 'checkbox') {
		c.checked = !c.checked;
	} else {
		c.checked = true;
	}
}

var isSubmitting = false;

function setTarget(target, action) {
    var form = document.buildYourAdvertForm || document.additionalInformationForm || document.paymentForm;
    form.target = target;
	form.action = action;
	if (target == '') isSubmitting = true;
}

function disableSubmitButtons(b) {
    for (var k=0; k < document.forms.length; k++) {
      for (var i=0; i < document.forms[k].elements.length; i++) {
        element = document.forms[k].elements[i];
        if (element.type == 'submit' || element.type == 'reset' || element.type == 'button') {
          element.disabled = true;
        }
      }
    }
    // change hidden field to hold submit value
    proxy = b.form.submitProxy;
    proxy.value = b.value;
    proxy.name = b.name;
    b.form.submit();
    return true;
}