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Validate integer fails for zero values

Velika Srbija
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In my validation.xml I have an entry:
<field property="id_article" depends="required,integer" >
<arg0 key="app.validator.error.id_article"/>

Everything works OK unless I enter 0 (zero) into "id_article" text field on my JSP. In that case JavaScript alerts a message saying 0 is not an integer.

I know there was a problem with parseInt() function in JavaScript 1.0, but I'm using IE6 and JavaScript1.1.

What is goin' on?
It is sorta covered in the JavaRanch Style Guide.
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