Scroll sur page html (frame)

<center><script type="text/javascript" language="javascript">
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IS_query_string=window.location.search.substr(1,window.location.search.length-1);
IS_query_string=IS_query_string.split('&');

IS_page=IS_jour=IS_mois=IS_annee=IS_idnews=0;
IS_keyword='';

for(i=0;i < IS_query_string.length;i++)
{
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    else if(IS_query_string[i].indexOf('idnews=') != -1)
    {
        IS_idnews=IS_query_string[i].substr(7,IS_query_string[i].length-7);
    }
}

document.write('<scr'+'ipt type="text/javascript" language="javascript" src="https://i-services.com/membres/newsbox/newsbox.php?uid=132441&sid=77271&idbox=1189&pgis=%27+IS_page+%27&url_page=%27+escape(document.location.href)+%27&keyword=%27+IS_keyword+%27&annee=%27+IS_annee+%27&mois=%27+IS_mois+%27&jour=%27+IS_jour+%27&idnews=%27+IS_idnews+%27"><'+'/scr'+'ipt>');
//-->
</script></center>

Configuration: Windows XP
Firefox 2.0.0.11