Validating the number of selected options in html:select multiple

Hi i am trying to validate the maximum number that can be selected from:
<html:select property="supportingWorkerIds" multiple="true" size="4"
                         tabindex="4">
<html:optionsCollection property="workerList" label="workerName"
                              value="userId" />
</html:select>
I want the user to not select more that 10 options for this. If its greater than 10 i want to display an error message.
I have tried adding the following in validation.xml:
<field property="supportingWorkerIds"
                    indexedListProperty="supportingWorkerIds" depends="validwhen">
<arg0 key="bookSeminarSessionForm.maxSupportWorkers" />
                    <var>
                         <var-name>test</var-name>
                         <var-value>( supportingWorkerIds.length > 10 )</var-value>
                    </var>
</field>
But it doesnt work .
Any suggestions?
Thanks in advance

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Validating the number of selected options in html:select multiple

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