html:img inside html:button

[elyes sallem]

i wanna use html:img inside html:button
here is the example :

<html:button property="test" onclick="modifierLigne(<%= index
%>,<%=((AjustContrat)ajustContrat).getAjustcontId() %>)">
                                        <html:img alt="<bean:message
key="commun.modifier"/>" src="img/modif.jpg" height="15px"
style="vertical-align: bottom"/>
                                        </html:button>
but i get this error , any one has an idea
equal symbol expected (in front of alt , in the html:img tag )

Regards
Elyes.