Grab GET URL variables from Javascript

getvars.js

// Grab GET URL variables from JS.
// credit: https://css-tricks.com/snippets/javascript/get-url-variables/

function getQueryVariable(variable)
{
     var query = window.location.search.substring(1);
     var vars = query.split("&");
     for (var i=0;i<vars.length;i++) {
             var pair = vars[i].split("=");
             if(pair[0] == variable){return pair[1];}
     }
     return(false);
}