alert box

I have a formule like this:
(setq bb_bw_h (/ (- bb_x (* bb_c 2) (* bb_b 2) bb_bw 30) (- bb_bw_a 1)))
When bb_bw_h reaches to high I want to display an alertbox.
(alert "To High")
So far So good.
Now I want to display the value of bb_bw_h I the alertbox Something like this:
(alert "To high = bb_bw_h")
Who want to help me?
Michel .
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(if (> (setq bb_bw_h (/ (- bb_x (* bb_c 2) (* bb_b 2) bb_bw 30) (- bb_bw_a 1))) <<MaxValue>>) (alert (strcat "Too high: " (rtos bb_bw_h))) bb_bw_h );;if ___

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<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
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