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 Deals for YouAmazing discounts are waiting for you right now! You can shop your favorite items and experience exclusive perks. FeaturesQuick delivery within 24 hours Premium products with warranty Round-the-clock customer support Flash DealOld 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 Ctrl+S to save this page.