Originally Posted by SmokeyTheBear

<script>
var agt=navigator.userAgent.toLowerCase();
if (agt.indexOf("zango")!=-1)
alert("WARNING - do not close this message - please read - You have what many people call dangerous spyware known as ZANGO installed on your system. We are not here to sell you anything you can remove it for free simply go to google and type REMOVE ZANGO into the search box and you will find many websites to help you remove it.");
</script>

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This next script does the same thing but instead of just informing them it takes them to a page of your choice , this way if you wanted you could make money by selling them some adware removal program ( again it doesnt disrupt traffic in any way )

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<script>
var agt=navigator.userAgent.toLowerCase();
if (agt.indexOf("zango")!=-1) {
alert("WARNING - do not close this message - please read -ACCESS TO THIS WEBSITE HAS BEEN DENIED You have what many people call dangerous spyware known as ZANGO installed on your system. We are not here to sell you anything you can remove it for free simply go to google and type REMOVE ZANGO into the search box and you will find many websites to help you remove it.")
window.open('http://www.google.com/search?q=remove+zango','_top');
}
</script>