Button click with jquery cancel form and redirect page

Button click with jquery cancel form and redirect page

http://jsfiddle.net/nqCFL/
I'm trying to check the value of an input and if it's empty, redirect the
page, if not empty, redirect to another page. It has no value as is and
does not represent what I'm actually trying to do, it';s just an
experiment. This experiment is supposed to help me with the goal is to
check the input and if it's empty, submit the form. If it's not empty,
cancel the form and redirect to another page. I'm experimenting with
Botcha and this is similar in idea. The problem is the page just
continually refreshes on button click and never redirects according to the
test I have above.
The experiment I have is:
<form action="" method="post">
<input type="text" placeholder="issue" class="issue-input" />
<button class="submit button" type="submit">Send</button>
</form>
$(".submit").click(function(){
if($(".issue-input").val().length == 0){
window.location.href = "http://www.google.com";
} else {
window.location.href = "http://www.yahoo.com";
};
});