button hide if input empty

by Keyur Bhatt

HTML

<input type="text" name ="mytxt" id="mytxt"> 
<a href="#" id="btnsubmit" class="btn1">Submit</a>

JavaScript

manageButton();

$('input[name=mytxt]').change(function() { 
manageButton();
});

function manageButton(){
  if($("#mytxt").val() == ""){
     $("#btnsubmit").hide();
  }else {
     $("#btnsubmit").show();
  }
}