Codigo para url

   <td colspan="3" bgcolor="#FFFFFF"><br><form method="POST" action="index.html">
 <center><b>Nick o Apodo:</b> <input type="text"  id='ingresar'  name="nombre" value="Alvarous" onclick="this.focus(); this.select(); this.value = ''" onfocus="if(this.value=='Escribe tu Apodo') { this.value=''; }" onblur="if(this.value=='') { this.value='Escribe tu Apodo'}" maxlength="35" /></center>
   </td>

http://webchat/chat.php?nick=[B]Alvarous[/B]&canal=%23chatgratis,%23Argentina

<script>
function Redireccionar()
{
var nick = document.getElementById('ingresar').value;
location = 'http://webchat/chat.php?nick='+nick+'&canal=%23chatgratis,%23Argentina';
}
</script>