Tracing malcodes in website

Is there any way to detect a website have malicious content or not ? Informing people, the website have viruses before they start surfing ?

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What, specifically, are you asking? Is there a problem you're trying to solve?

Adrian

Thanks for your information...
Is there any open source applications are available for this?
I want to include this facility in my small project :). Will let you know the things after i finished half point of work...