var ad_tags_to_inject = [
{account_id: '70585', campaign_id: '468731', width: '300', height:'250' ,  ad_tag_placement: 'prepend://H3[@id="post-309"]', website_id:'15479'}
,{account_id: '70585', campaign_id: '468731', width: '300', height:'250' ,  ad_tag_placement: 'append://FORM[@id="commentform"]/P[1]', website_id:'15479'}
,{account_id: '70585', campaign_id: '475734', width: '300', height:'250' ,  ad_tag_placement: 'append://DIV[@id="container"]/DIV[1]/DIV[2]/P[1]', website_id:'15480'}
];