$riga="$riga"."<table><tr><td colspan='3' class='riga'>ciao</td></tr>
<tr><td>jjjjjjjj jjjjjjjj - ooooooo - jjjjjjjjj</td><td></td><td></td></tr>
<tr><td colspan='3'>okokokok</td></tr>
<tr><td colspan='3'><a href=\"#\" onclick=\"window.open('http://www.dominio/page.php', '', 'width=616,height=316,left=9,top=9,bottom=9,right= 9,menubar=no,toolbar=no,scrollbars=yes,locations=n o,status=no');\">quick details</a></td></tr>
<tr><td></td><td align='right' width='116'>Price for jjjjjjjjjjj ooooooo:</td><td width='92' align='right'> oooooooo</td></tr></table>";

Non mi stampa bene $riga...