How can I include address bar variable in this javascript line? -

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can please tell me how can add in address bar variable javascript?

the website address reads: www.example.com/index.php?user=74

and javascript needs include 'user = 74' is:

xmlhttp.open("get","../profile/" + pagename + ".php",true); 

function get_query(){   var url = location.href;   var qs = url.substring(url.indexof('?') + 1).split('&');   for(var = 0, result = {}; < qs.length; i++){     qs[i] = qs[i].split('=');     result[qs[i][0]] = decodeuricomponent(qs[i][1]);   }   return result; }  xmlhttp.open("get","../profile/" + pagename + ".php?user=" + get_query()['user'],true);

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