<p class="blink">立科プログラミング</p>
var msec = 2000; //点滅周期
var obj = document.getElementsByClassName("blink");
var i = 0;

function blink_off(){
  i = 0;
  for( i = 0; i <obj.length; i++){
    obj[i].style.visibility = "hidden";
  }        
}

function blink() {
    for( i = 0; i <obj.length; i++){
      obj[i].style.visibility = "visible";
    }
    setTimeout(blink_off, msec * 3/4);
}

setInterval( blink, msec );

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