function start() {
	setInterval(everySecond, 1000);
}

var clockLit=false;
function everySecond() {
	var colon1=document.getElementById("colon1");
	var colon2=document.getElementById("colon2");
	if(!clockLit) {
		colon1.style.color="#4E4E4E";
		colon2.style.color="#4E4E4E";
		clockLit=true;
	}
	else {
		colon1.style.color="#C3C3C3";
		colon2.style.color="#C3C3C3";
		clockLit=false;
	}
}