I need a solution to parse the value in the URL split between `%2526_ga%253d` and `&wct` then append `&_ga=` + `the parsed value` to the end of the same URL.

This is my URL, which is always different but `%2526_ga%253d` and `&wct` is always the same.
<http://www.example.com/wa=wsignin1.0%2526_ga%253d1.193373933.1506621463.1391436765&wct=2014-04-25T19>

The end result would be:
<http://www.example.com/wa=wsignin1.0%2526_ga%253d1.193373933.1506621463.1391436765&wct=2014-04-25T19>`&_ga=1.193373933.1506621463.1391436765`

I completed my solution and this works:

```
var gacookie = window.location.search.match('_ga%253d(.+)&wct=');
var url = window.location.href;

if (url.indexOf('_ga') > -1) {
        url += '&_ga=' + gacookie[1]
        parent.location.hash = url
        var hash = location.hash.replace('#', gacookie[1]); 
        if(hash != '') {
        location.hash = '&_ga=' + gacookie[1];
    }
}

```