var queryString = new Array();
var parameters = window.location.search.substring(1).split('&');

queryString["utm_campaign"] = 1;
queryString["utm_medium"] = 1;
queryString["utm_source"] = 99;

for (var i=0; i<parameters.length; i++) {
    var pos = parameters[i].indexOf('=');

    if (pos > 0) {
        var paramname = parameters[i].substring(0,pos);
        var paramval = parameters[i].substring(pos+1);
        queryString[paramname] = unescape(paramval.replace(/\+/g,' '));
    } else {
        queryString[parameters[i]]="";
    }
}