image slider works BUT has an error before

the following error appears just before tha applate (at my front end page):

Strict Standards: Only variables should be assigned by reference in /srv/disk4/1460218/www/yarokzait.co.il/modules/mod_hot_image_slider/tmpl/default.php on line 15

what should i do in order to avoid this kind of error in site?

my site is www.yarokzait.co.il and the gallery is on "גלריה חדשה" (new gallery)

thanks in advanced

dudu nitzan

Just level down "Error reporting" parameter value in global configuration. that is just harmless warning