html - URL string cannot pass to GA Custom Variables via javascript -

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i attempting parse url string custom variable in ga using javascript. string want parsed value after parameter etid=

so example using www.site.com/?etid=1234kks0, variable gets returned should 1234kkso.

the code using seems work in browser console when recall variable name, not return in ga, 

function getqueryvariable(variable) {        var query = window.location.search.substring(1);        var vars = query.split("&");        (var i=0;i<vars.length;i++) {                var pair = vars[i].split("=");                if(pair[0] == variable){return pair[1];}        }        return(false); }   var etid = getqueryvariable("etid");   _gaq.push(['_setcustomvar',4,'user',etid,1]);


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