if (document.images) {
  var btn_signin_off = new Image();
  btn_signin_off.src = "images/btn_signin_off.gif";
  var btn_signin_on = new Image();
  btn_signin_on.src = "images/btn_signin_on.gif";
  
  var btn_webvote_off = new Image();
  btn_webvote_off.src = "images/btn_webvote_off.gif";
  var btn_webvote_on = new Image();
  btn_webvote_on.src = "images/btn_webvote_on.gif";
  
  var btn_rules_off = new Image();
  btn_rules_off.src = "images/btn_rules_off.gif";
  var btn_rules_on = new Image();
  btn_rules_on.src = "images/btn_rules_on.gif";
}

function onbutton(imgName) {
  if (document.images)
    document.images[imgName].src = eval(imgName + "_on.src");
}

function offbutton(imgName) {
  if (document.images)
    document.images[imgName].src = eval(imgName + "_off.src");
}

function testRadioButton (form) {
	var selected = false;
	for (var count=0;count<3;count++) {
		if (document.forms.voteForm.q1[count].checked) {
			selected = true;
		}
	}
	if (!selected) {
		alert("Please select an answer");
		return false;
	}
}