var blink_flag = new Array;

function make_blinked(el_id,color_one,color_two,timeout) {
  var element = document.getElementById(el_id);

  if (blink_flag[el_id] == 1){
    element.style.color=color_one;
    blink_flag[el_id] = 2;
  }else{
    element.style.color=color_two;
    blink_flag[el_id] = 1;
  }
  setTimeout("make_blinked('"+el_id+"','"+color_one+"','"+color_two+"','"+timeout+"')",timeout);
}