prototype - Replace & with &

I am working with Magento which uses the prototype javascript library. Unfortunately some of the client's data (being fed from point of sale system in to Magento) has & in the html instea开发者_如何学编程d of &.

Can anyone help with a method to change all instances of & in the html to & for validation purposes?

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Use escapeHTML, part of Prototype's String library.