Making a form field required when another field is selected

I have a contact form with the usual fields required (name, address, city, etc.). I'm adding a Country pull-down list to the form, which will default to the US being selected. Since a "State" field is not relevant for anyone filling out the form from another country, I'd like to make the State field required only if the country selected is United States, and not required for any other country. Is there a way to do this?
Thanks,
R-Co

What you need is to be able to create a required textfield when the first textfield shows USA and destroy the required field when another country is selected.
The following may help to understand create and destroy
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Deleting and rebuilding validations</title>
<link href="http://labs.adobe.com/technologies/spry/widgets/textfieldvalidation/SpryValidationTextFiel d.css" rel="stylesheet">
</head>
<body>
<form id="form1" method="post" action="#">
<p>
    <input type="radio" name="radio" id="Married" value="Married" onclick="val(this);">
    <label for="Married">Married</label>
</p>
<p>
    <input type="radio" name="radio" id="Defacto" value="Defacto" onclick="val(this);">
    <label for="Defacto">Defacto</label>
</p>
<p>
    <input type="radio" name="radio" id="Single" value="Single" onclick="val(this);">
    <label for="radio">Single</label>
</p>
<hr>
<span id="sprytextfield1">
    <label for="f_married">Married</label>
    <input name="married" id="f_married" type="text" value="">
    <span class="textfieldRequiredMsg">A value is required.</span>
</span>
<span id="sprytextfield2">
    <label for="f_defacto">Defacto</label>
    <input name="defacto" id="f_defacto" type="text" value="">
    <span class="textfieldRequiredMsg">A value is required.</span>
</span>
<span id="sprytextfield3">
    <label for="f_single">Single</label>
    <input name="single" id="f_single" type="text" value="">
    <span class="textfieldRequiredMsg">A value is required.</span>
</span>
<hr>
<input type="submit" value="Submit" />
</form>
<script src="http://labs.adobe.com/technologies/spry/includes_minified/SpryValidationTextField.js"></script>
<script>
var sprytextfield1,
        sprytextfield2,
        sprytextfield3;
// build validations and delete / destroy them
function val(e){
    // get the value
    value = e.value;
    // see what radion button we have
    if(value == "Married"){
        // if there inst a validaton build one
        if(!sprytextfield1){
            sprytextfield1 = new Spry.Widget.ValidationTextField("sprytextfield1");
        // if there is a validaiton in sprytextfield destory it, and clear the variable
        if(sprytextfield2 && sprytextfield2.destroy){
            sprytextfield2.resetClasses();
            sprytextfield2.destroy();
            sprytextfield2 = null;
        // same as the rest
        if(sprytextfield3 && sprytextfield3.destroy){
            sprytextfield3.resetClasses();
            sprytextfield3.destroy();
            sprytextfield3 = null;
    } else if(value == 'Defacto'){
        if(!sprytextfield2){
            sprytextfield2 = new Spry.Widget.ValidationTextField("sprytextfield2");
        if(sprytextfield1 && sprytextfield1.destroy){
            sprytextfield1.resetClasses();
            sprytextfield1.destroy();
            sprytextfield1 = null;
        if(sprytextfield3 && sprytextfield3.destroy){
            sprytextfield3.resetClasses();
            sprytextfield3.destroy();
            sprytextfield3 = null;
    } else if(value == 'Single'){
        if(!sprytextfield3){
            sprytextfield3 = new Spry.Widget.ValidationTextField("sprytextfield3");
        if(sprytextfield1 && sprytextfield1.destroy){
            sprytextfield1.resetClasses();
            sprytextfield1.destroy();
            sprytextfield1 = null;
        if(sprytextfield2 && sprytextfield2.destroy){
            sprytextfield2.resetClasses();
            sprytextfield2.destroy();
            sprytextfield2 = null;
    // proceed with the rest as normal
    return true;
</script>
</body>
</html>

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hi one and all
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Making a form field required when another field is selected

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