diff --git a/htdocs/comm/action/pertype.php b/htdocs/comm/action/pertype.php
index 8b6119eb294..43d55424cd3 100644
--- a/htdocs/comm/action/pertype.php
+++ b/htdocs/comm/action/pertype.php
@@ -1236,9 +1236,9 @@ function show_day_events_pertype($username, $day, $month, $year, $monthshown, $s
 			$color2 = '222222';
 		}
 		print '<table class="nobordernopadding" width="100%">';
-		print '<tr><td '.($color1 ? 'style="background: #'.$color1.';"' : '').'class="'.($style1 ? $style1.' ' : '').'onclickopenref'.($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_00_'.($ids1 ? $ids1 : 'none').'"'.($title1 ? ' title="'.$title1.'"' : '').'>';
+		print '<tr><td '.($color1 ? 'style="background: #'.$color1.';"' : '').'class="'.($style1 ? $style1.' ' : '').'onclickopenref center'.($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_00_'.($ids1 ? $ids1 : 'none').'"'.($title1 ? ' title="'.$title1.'"' : '').'>';
 		print $string1;
-		print '</td><td '.($color2 ? 'style="background: #'.$color2.';"' : '').'class="'.($style2 ? $style2.' ' : '').'onclickopenref'.($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_30_'.($ids2 ? $ids2 : 'none').'"'.($title2 ? ' title="'.$title2.'"' : '').'>';
+		print '</td><td '.($color2 ? 'style="background: #'.$color2.';"' : '').'class="'.($style2 ? $style2.' ' : '').'onclickopenref center'.($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_30_'.($ids2 ? $ids2 : 'none').'"'.($title2 ? ' title="'.$title2.'"' : '').'>';
 		print $string2;
 		print '</td></tr>';
 		print '</table>';
diff --git a/htdocs/comm/action/peruser.php b/htdocs/comm/action/peruser.php
index e2bc5931d66..f74974a26d9 100644
--- a/htdocs/comm/action/peruser.php
+++ b/htdocs/comm/action/peruser.php
@@ -1441,7 +1441,7 @@ function show_day_events2($username, $day, $month, $year, $monthshown, $style, &
 		}
 		print 'class="';
 		print ($style1 ? $style1.' ' : '');
-		print 'onclickopenref'.($title2 ? ' classfortooltip' : '').($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_00_'.($ids1 ? $ids1 : 'none').'"'.($title1 ? ' title="'.$title1.'"' : '').'>';
+		print 'onclickopenref center'.($title2 ? ' classfortooltip' : '').($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_00_'.($ids1 ? $ids1 : 'none').'"'.($title1 ? ' title="'.$title1.'"' : '').'>';
 		print $string1;
 		print '</td><td ';
 		if ($style2 == 'peruser_notbusy') {
@@ -1451,7 +1451,7 @@ function show_day_events2($username, $day, $month, $year, $monthshown, $style, &
 		}
 		print 'class="';
 		print ($style2 ? $style2.' ' : '');
-		print 'onclickopenref'.($title2 ? ' classfortooltip' : '').($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_30_'.($ids2 ? $ids2 : 'none').'"'.($title2 ? ' title="'.$title2.'"' : '').'>';
+		print 'onclickopenref center'.($title2 ? ' classfortooltip' : '').($title1 ? ' cursorpointer' : '').'" ref="ref_'.$username->id.'_'.sprintf("%04d", $year).'_'.sprintf("%02d", $month).'_'.sprintf("%02d", $day).'_'.sprintf("%02d", $h).'_30_'.($ids2 ? $ids2 : 'none').'"'.($title2 ? ' title="'.$title2.'"' : '').'>';
 		print $string2;
 		print '</td></tr>';
 		print '</table>';