I have an input text box and a search submit button, and when user clicks the Search submit button, I want to redirect user to url http://testsearch/results.aspx?k=<value of text box k>, for example, if user put StackOverflow into text box and then clicks the search button, I want to redirect user to the following page,

http://testsearch/results.aspx?k=StackOverflow

I find when I use button for Search button, it works (see below source codes),

  <input type=text id=k name=k />

  <input type=button id=Go value=Search onclick=location.href = 'http://somemachine/Search/results.aspx?k='+document.getElementById('k').value;/>

but when I use submit for Search button, it does not works (see below source codes), why?

  <input type=text id=k name=k />

 <input type=submit id=Go value=Search onclick=location.href = 'http://somemachine/Search/results.aspx?k='+document.getElementById('k').value;/>

thanks in advance,
George