How to add Textbox value into hyperlink URL string?

小帅哥飞飞

想在下面URL string 加入一个Textbox 的值，应该怎么写？

<P><INPUT  name = promo_code value="SGR07"></P>

<A HREF="http://www.myweb.com/home/
?action=SUBSCRIPTION&amp;term_country=China&amp;sub_type=GIFT&amp;
promo_code=promo_code.value">

homepage</A>

cityvoice

<P><INPUT  name = promo_code id=promo_code value="SGR07"></P>

<A  id="mylink" HREF="http://www.myweb.com/home/
?action=SUBSCRIPTION&term_country=China&sub_type=GIFT">

homepage</A>
<script language="javascript">
document.getElementById("mylink").href+="&promo_code="+document.getElementById("promo").value;
</script>

或者
<A  HREF="http://www.myweb.com/home/
?action=SUBSCRIPTION&term_country=China&sub_type=GIFT" onclick="this.href+='&promo_code='+document.getElementById('promo_code').value">