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From 2012hs.igem.org

function getValue(varname) { // First, we load the URL into a variable var url = window.location.href; // Next, split the url by the ? var qparts = url.split("?"); // Check that there is a querystring, return "" if not if (qparts.length == 0) { return ""; } // Then find the querystring, everything after the ? var query = qparts[1]; // Split the query string into variables (separates by &s) var vars = query.split("&"); // Initialize the value with "" as default var value = ""; // Iterate through vars, checking each one for varname for (i=0;i