Get URL query parameters

get-params.js

// Returns the paramters as an object, key=>value pairs
function getParameters(url){
  var paramList = [], params = {}, kvPairs, tmp;
  url = (url !== '' && typeof url === 'string') ? url : document.URL;
  if(url){
    if(url.indexOf("?") !== -1){
      paramList = url.split("?")[1];
      if(paramList){
        if(paramList.indexOf("&")){
          kvPairs = paramList.split("&");
        } else {
          kvPairs = [paramList];
        }
        for(var a=0;a<kvPairs.length;a++){
          if(kvPairs[a].indexOf("=") !== -1){
            tmp = kvPairs[a].split("=");
            params[tmp[0]] = unescape(tmp[1]);
          }
        }
      }
    }
  }
  return (params) ? params : null;
}