function blink(){
	if(document.all){
		if(document.all("blinkid").style.visibility == "visible"){
			document.all("blinkid").style.visibility = "hidden";
		}else{
			document.all("blinkid").style.visibility = "visible";
		}
	}else if(document.getElementById){
		if(document.getElementById("blinkid").style.visibility == "visible"){
			document.getElementById("blinkid").style.visibility = "hidden";
		}else{
			document.getElementById("blinkid").style.visibility = "visible";
		}
	}else{
		return;
	}
	setTimeout(blink, 800);
}
window.onload = blink;

/*HTML
<div id="blinkid"><blink>点滅する</blink></div>
*/