<p class="required text"> 
            <label for="customer_firstname">{l s='First name'}</label> 
            <input onkeyup="$('#firstname').val(this.value);" type="text" class="text" id="customer_firstname" name="customer_firstname" value="{if isset($smarty.post.customer_firstname)}{$smarty.post.customer_firstname}{/if}" /> 
         
        </p> 
        <p class="required text"> 
            <label for="customer_lastname">{l s='Last name'}</label> 
            <input onkeyup="$('#lastname').val(this.value);" type="text" class="text" id="customer_lastname" name="customer_lastname" value="{if isset($smarty.post.customer_lastname)}{$smarty.post.customer_lastname}{/if}" /> 
         
      
        </p> 
        <p class="required text" id="address_alias"> 
            <label for="alias">{l s='Assign an address title for future reference'} </label> 
            <input type="text" class="text" name="alias" id="alias" value="{if isset($smarty.post.alias)}{$smarty.post.alias}{else}{l s='My address'}{/if}" /> 
            <sup>*</sup> 
        </p>

1. <p class="required text">
2.    <label for="customer_lastname">{l s='Last name'}</label>
3.     <input onkeyup="$('#lastname').val(this.value);$('#alias').val($('customer_firstname').val()+' '+$('customer_lastname').val());" type="text" class="text" id="customer_lastname" name="customer_lastname" value="{if isset($smarty.post.customer_lastname)}{$smarty.post.customer_lastname}{/if}" />
4.           ^*
5.   </p>