<form>
    <input type="button" onclick="nextPage('Disney')" value="Disney Ducks">
    <input type="button" onclick="nextPage('Warner')" value="Warner Ducks">
  </form>

  <script language="Javascript">
   function nextPage(strStudio) {
      var strSearch = "?studio=" + strStudio; 
      if (strStudio == "Warner") strSearch += "&ducks=Daffy";
      if (strStudio == "Disney") strSearch += "&ducks=Huey+%2C+Duey+%26+Looey";
      var newLocation = "http://www.someSite.com/Page2.html" + strSearch

      location.assign(newLocation)
   }
   </script>

<script language="Javascript">
function plusUnescape(str) { // the unescape function won't convert plus signs
         str = '' + str;     // to spaces; like you see in search strings
         while (true) {
               var j = str.indexOf('+');
               if (j == -1) break;
               str = str.substring(0,j) + ' ' + str.substring(j+1,str.length);
         }
         return unescape(str);
}

function getArgument (theKey) {
         var args = new Array ();
         var argstring = window.location.search;
         if (argstring.charAt(0) != '?') return false;
         argstring = argstring.substring(1, argstring.length);
         var argarray = argstring.split('&');
         for (var j=0; j < argarray.length; j++) {
         var singlearg = argarray[j].split('=');
             if (singlearg.length != 2) continue; // not a valid argument
             var argsKey    = plusUnescape(singlearg[0]);
             var argsValue  = plusUnescape(singlearg[1]);
             args [argsKey] = argsValue;
         }
         return args[('' + theKey)]
}

function whichDucks() {
         var strStudio = getArgument("studio")
         if (!strStudio) return false; // nothing passed
         var strDucks = getArgument("ducks")
         alert("The " + strStudio + " studio created the duck(s) " + strDucks)
}
</script>

  <form>
    <input type="button" onclick="whichDucks()" value="Which Ducks">
  </form>