<script type="text/javascript">
function Send() {
   var host_str = 'http://test.ru/index.php?';
   for(var i =  0 ; i < document.test1.elements.length; i++){
     if (document.test1.elements[i].name != ''){
       host_str+= document.test1.elements[i].name + '=' + document.test1.elements[i].value + '&';
     }
   }
   host_str+= '1=1';
   window.open(host_str)
   window.open(host_str)
   return false
}
</script>
<form name="test1" method='get'>
<input type="text" name="txt1" value="xxx">
<input type="text" name="txt2" value="yyy">
<input type="submit" value="GO!!!" OnClick="JavaScript:Send();">
</form>