i have this code
<image src='/img/navigation/delete.png'/> the image shows OK.
<menupopup id="listmenu">
<menuitem label="Delete" image="img/navigation/delete.png"/>//image dont show at all
</menupopup>
i have also try using single quotes double quotes without success starting with slash or without also try static internet resources.
image='/img/navigation/delete.png'
image='img/navigation/delete.png'
image="/img/navigation/delete.png"
image="img/navigation/delete.png"
image="https://www.google.com.tw/images/icons/product/chrome-128.png"
the image on the image tag shows good but dont show on the menuitem even when they have the same path...
UPDATE
i have check the sample provided by ZK and this is the ZUL code Zk Official Page
<menuitem image="/widgets/menu/context_menu/img/UserProfileMale-16x16.png" label="Profile" />
this generate this HTML
<a href="javascript:;" id="b9FVk-a" class="z-menuitem-content">
<img src="/zkdemo/widgets/menu/context_menu/img/UserProfileMale-16x16.png;jsessionid=690619C76D278163402749B336894F89.zkdemo" class="z-menuitem-image" align="absmiddle">
<span class="z-menuitem-text">Profile</span>
</a>
and the image shows OK.
but my ZUL
<menuitem label="Delete" image="/img/navigation/delete.png"/>
generates this HTML
<a href="javascript:;" id="b2IQyj3-a" class="z-menuitem-cnt">
<span class="z-menuitem-img" style="background-image:url(/main/img/navigation/delete.png)"></span>
Delete
</a>
they differs a lot i am Using ZK. EE 6.5.2 what i am doing wrong..
i also try to do this by hand using Debugger http://sourceforge.net/p/zk1/bugs/2244/ without success.
Tested Browsers
Chrome latest version[Versión 32.0.1700.76 m]
Mozilla latest version[26.0]..
Environment
Apache Tomcat/7.0.41
ZK 6.5.2 EE (build: 2013032614)
Java SE 7 jdk1.7.0_21
Windows Seven 64 bits.
Oke I reproduced your problem on Zk fiddle here
As you can see it works under zk 7.0.0 but but doesn't work zk 6.5.2 and zk 6.5.3.
I tested myself to under zk 6.5.3. If I set the google image, I don't get the image in the popup. But if I make a delete.png image local it works (but it is caption sensitive!).
Very strange...
But for your project, try (if you are allowed) to upgrade to 6.5.3 and test there.
edit : I added to your bugreport this fiddle.
Greetz chill.