Takes parameters form a url after a # in the form of <formID>=<value>& Source: http://htmlasks.com/pre_fill_form_field_via_url_in_html

parseHashURL.js

var hashParams = window.location.hash.substr(1).split('&'); // substr(1) to remove the `#`
if (hashParams[0] != ""){
    for(var i = 0; i < hashParams.length; i++){
        var p = hashParams[i].split('=');
        document.getElementById(p[0]).value = decodeURIComponent(p[1]);
    }
}