Probleme alert cannot resolve symbol

bonjour,

j'ai un probleme alert en jsp (cannot resolve symbol)
il reconnait pas c'est quelle classe pour l import ?
java.

voici l erreur
C:\Program Files\Business Objects\Tomcat\work\Catalina\localhost\businessobjects_enterprise11_desktoplaunch\org\apache\jsp\opendoc\view_005freport_005fpack5_jsp.java:183: cannot resolve symbol
symbol : method alert (java.lang.String)
location: class org.apache.jsp.opendoc.view_005freport_005fpack5_jsp
alert("The date format should be : dd/mm/yyyy");


merci