Check Cookie value to fire order tracking script

I have set a cookie whenever a user clicks through one of our affiliate links and lands on our site with "src=uni" in the URL. The URLs looks something like this: http://ift.tt/1d0QozU]

My Script to set cookie:

function SetCookie() {
    var url = window.location.search;
    if(url.indexOf('?src=uni') !== -1)
        document.cookie="src=uni";
}

When a user makes a purchase, I want the site to look for this cookie on my Receipt page and if it's present, then the tag should have 'FIREuni' : 'TRUE'. If the cookie is not present, the tag should have 'FIREuni' : 'FALSE'.

my object for which I want to set the value of FIREuni based upon cookie presence:

<script type="text/javascript"> 


function getCookie(src) {
    var QryParam = src + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(QryParam) == 0) return c.substring(QryParam.length,c.length);
    }
    return "";
}


function checkCookie() {
    var src=getCookie("src");
    if (src!="") {
        FIREuni:'TRUE'
        var TrackObject = {

'CJ' : {

'CID': '12346',
'TYPE': '7865',
'OID': 'ORDERNUMBER',
'CURRENCY':'USD',
'DISCOUNT': '',
'COUPON': '',

PRODUCTLIST : [

  {   'ITEM': 'item.variant.sku',
      'AMT': 'OTOTAL',
      'QTY': 'OTY'
},
 {   'ITEM': 'item.variant.sku',
      'AMT': 'OTOTAL',
      'QTY': 'OTY'
}
]
}};

    }
    else
    {
      FIREuni:'FALSE'
          var TrackObject ={


'UNI' : {

'CID': '',
'TYPE': '',
'OID': '',
'CURRENCY': '',
'DISCOUNT': '',
'COUPON': '',

PRODUCTLIST : [

  {   'ITEM': '',
      'AMT': '',
      'QTY': ''
}
]
}
};
        }
    } 


</script>

My Question is how do I change the value based upon the presence of src='uni', can somebody guide me towards a potential solution?