<script ...>
   param1var = ...   // ... would be replaced with the code to get asdf from url
</script>

<script>
var param1var = getQueryVariable("param1");

function getQueryVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  }
  alert('Query Variable ' + variable + ' not found');
}
</script>

function querystring(key) {
   var re=new RegExp('(?:\?|&)'+key+'=(.*?)(?=&|$)','gi');
   var r=[], m;
   while ((m=re.exec(document.location.search)) != null) r[r.length]=m[1];
   return r;
}

var param1var = querystring("param1")[0];

document.write(querystring("name"));

if (querystring('id')=='42') alert('We apoligize for the inconvenience.');

if (querystring('button').length>0) alert(querystring('info'));

function gup( name ){
   name = name.replace(/[[]/,"\[").replace(/[]]/,"\]");
   var regexS = "[\?&]"+name+"=([^&#]*)";
   var regex = new RegExp( regexS );
   var results = regex.exec( window.location.href );
   if( results == null )
      return "";
   else
      return results[1];
}

var matches = /param1=([^&#=]*)/.exec(window.location.search);
var param1 = matches[1];