If we want to submit form using text instead of convencial submit button then follow the article.
We’ve have to use following javascript code on click event.
document.formname.submit()
For Example:
<form action='newsletter/index' name='newsletter'> <input type="text" name="email" class="smalltxt" /><br /> <a href="javascript:;" onclick="document.newsletter.submit()">Submit</a> </form> Hope this will help you.