function get(obj,posting) {
      var getstr = "?";
      for (i=0; i<obj.childNodes.length; i++) {
         if (obj.childNodes[i].tagName == "INPUT") {
            if (obj.childNodes[i].type == "text") {
               getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
            }
            if (obj.childNodes[i].type == "checkbox") {
               if (obj.childNodes[i].checked) {
                  getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
               } else {
                  getstr += obj.childNodes[i].name + "=&";
               }
            }
            if (obj.childNodes[i].type == "radio") {
               if (obj.childNodes[i].checked) {
                  getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
               }
            }
         }   
         if (obj.childNodes[i].tagName == "SELECT") {
            var sel = obj.childNodes[i];
            getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
         }
      }
      makeRequest(posting, getstr);
   }

<form action="javascript:get(document.getElementById('myform'),'kayit.php');" name="myform" id="myform">
<input type="text" name="myfield" value="teststring"><br>
<input type="radio" name="myradio" value="0" checked> 0
<input type="radio" name="myradio" value="1"> 1<br>
<input type="checkbox" name="mycheck1" value="1"> 1
<input type="checkbox" name="mycheck2" value="2"> 2
<input type="checkbox" name="mycheck3" value="3"> 3
<input type="checkbox" name="mycheck4" value="4"> 4
<input type="checkbox" name="mycheck5" value="5"> 5
<br>
<select name="myselect">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<br>
<input type="button" name="button" value="Submit" 
   onclick="javascript:get(this.parentNode,'kayit.php');">
<input type="submit" name="button" value="Normal Submit Button">
</form>