var wooYayIntervalId = 0; function wooYayClickHandler ( ) { if ( document.getElementById("wooYayButton").value == "Click me!" ) { // Start the timer document.getElementById("wooYayButton").value = "Enough already!"; wooYayIntervalId = setInterval ( "wooYay()", 1000 ); } else { document.getElementById("wooYayMessage").innerHTML = ""; document.getElementById("wooYayButton").value = "Click me!"; clearInterval ( wooYayIntervalId ); } } function wooYay ( ) { if ( Math.random ( ) > .5 ) { document.getElementById("wooYayMessage").innerHTML = "Woo!"; } else { document.getElementById("wooYayMessage").innerHTML = "Yay!"; } setTimeout ( 'document.getElementById("wooYayMessage").innerHTML = ""', 500 ); }