If you need to continuously monitor for the checkbox state (rather than just checking once), you could modify it like this: If you need to monitor the constantly, you could modify it like this. Best Offers for YouAmazing savings are waiting for you right now! You can shop your favorite items and enjoy special perks. HighlightsFast delivery within 24 hours High-quality products with warranty 24/7 customer support Limited-time OfferOld Price: $99 New Price: $49 "Excellent support and awesome quality!" — Happy Customer Instant InfoWater formula: H2O Einstein’s equation: E = mc2 Browse Products Add to Cart Checkout Use Command+S to save this page.