[fix] relative menu problem in ie7
[fix] relative menu problem in ie7

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extra : convert_revision : nicolas.vanhoren%40openerp.com-20110518152311-c1znrhfdzkljs2lm

gisce/openerp-web,MarkusTeufelberger/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web