Function JavaScript with javascript variable

Hello,
I want to call a javaScript function with javaScripts variable in html 
document, like
onclick="functionX('a',variableJavaScript);"
it doesn't work. Do you have any idea who can i solve my problem?

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Márcio Ferreira <mferreira(_at_)telbit(_dot_)pt>
Telbit - Tecnologias de Informação