<input class="lookup_field" name="{$lookup_field_name}" type="text" size="24" tabindex="{$tabindex}"
    value="{t}paste or start typing here{/t}" 
    onBlur="javascript:this.value='{t}paste or start typing here{/t}';" 
    onFocus="javascript:this.value='';" 
    onKeyUp="javascript:lookupField(this.form, this, '{$lookup_field_target}', {if $callbacks != ""}{$callbacks}{else}null{/if});">