$questoistante="$a$m$g$h$min";
$queryblog = "SELECT * FROM blog_post WHERE tipo = '1' and amghms_pubb < $questoistante order by amghms_pubb desc";
$resultblog= mysql_query($queryblog,$db);
while($arrayblog=mysql_fetch_array($resultblog)){
$conta_post=$conta_post+1;
if($conta_post=="1"){echo"