Get the Value of an URL Parameter From http://codesr.thewebflash.com/2014/09/get-value-of-url-parameter.html

get-val-URL-param.js

function getURLParameter(sParam)
{
    var sPageURL = window.location.search.substring(1);
    var sURLVariables = sPageURL.split('&');
    for (var i = 0, len = sURLVariables.length; i < len; i++) 
    {
        var sParameterName = sURLVariables[i].split('=');
        if (sParameterName[0] == sParam) 
        {
            return sParameterName[1];
        }
    }
}