Question

I want this entire string http://mywebsite.com?u=http://othersite.com?thisis sent at once . if I put it in a URL shortener like bit.ly it works, but not if I leave it as it is it breaks.

<script>
  function go(){
    window.frames[0].document.body.innerHTML='<form target="_parent" action="http://mywebsite.com?u=http://othersite.com?thisis"></form>';
    window.frames[0].document.forms[0].submit()
  }    
</script>

Answer 1

try

<script>
  function go(){
    window.frames[0].document.body.innerHTML='<form target="_parent" action="http://mywebsite.com?u=' + encodeURIComponent('http://othersite.com?thisis') + '"></form>';
    window.frames[0].document.forms[0].submit()
  }    
</script>