Solve : Black out webpage with an alert, then take it to normal??

1.	Solve : Black out webpage with an alert, then take it to normal??
Answer» I SEE websites that have a code where you can click a LINK, and the screen turns black with like a transparency of 0.5, then shows an alert. ....... How would I do this? Code: [SELECT]<a href="#" onclick="document.style.backgroundOpacity='0.5'; alert('This is an alert!');"&GT;Click</a> Does that work?OOPS. I FORGOT to add: How would I make it clear the screen once the alert is removed?

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