js-querystring.js

// Extract "GET" parameters from a JS include querystring
function getParams(script_name) {
  // Find all script tags
  var scripts = document.getElementsByTagName("script");
  
  // Look through them trying to find ourselves
  for(var i=0; i<scripts.length; i++) {
    if(scripts[i].src.indexOf("/" + script_name) > -1) {
      // Get an array of key=value strings of params
      var pa = scripts[i].src.split("?").pop().split("&");

      // Split each key=value into array, the construct js object
      var p = {};
      for(var j=0; j<pa.length; j++) {
        var kv = pa[j].split("=");
        p[kv[0]] = kv[1];
      }
      return p;
    }
  }
  
  // No scripts match
  return {};
}

// Mini version :)
function getParams(a){var b=document.getElementsByTagName("script");for(var i=0;i<b.length;i++){if(b[i].src.indexOf("/"+a)>-1){var c=b[i].src.split("?").pop().split("&");var p={};for(var j=0;j<c.length;j++){var d=c[j].split("=");p[d[0]]=d[1]}return p}}return{}}