In a table in an HTML page, I'm trying to merge a few cells (span on a few rows, depending on a previously-defined variable plus 10 extra).

When I use

<th rowspan=10+<%=entries_count%>>CELLTEXT</th>

I get it to span on 10 rows (without the variable count).

if I use 

<th rowspan= <%=entries_count%>+ 10>CELLTEXT</th>

it spans on the number defined by the entries_count variable (not adding the 10)

How can I sum the two inside the "rowspan" command?

Adding () got me nowhere.

(WITHOUT setting a new variable for it...)

Thanks!