function NewMark(y,m,d) {
  oldDay = new Date(y+"/"+m+"/"+d);
  newDay = new Date();
  n = (newDay - oldDay)/(1000*60*60*24);
  if (n <= 30) document.write('<SPAN class="new">NEW</SPAN>');
}

function NewMark2(y,m,d) {
  oldDay = new Date(y+"/"+m+"/"+d);
  newDay = new Date();
  n = (newDay - oldDay)/(1000*60*60*24);
  if (n <= 30) document.write('<IMG src="work_img/new.gif">');
}