function mouseOverProc()
{
  var s = this.src;
  this.src = s.replace(/^(.*)\.jpg$/, "$1_a.jpg");
}
function mouseOutProc()
{
  var s = this.src;
  this.src = s.replace(/^(.*)\_a.jpg$/, "$1.jpg");
}
function target_blank( url ){
  window.open( url,"sub_window","width=620,height=680,resizable=0,scrollbars=0,toolbar=0,menubar=0,location=0,directories=0,status=0,left=10,top=10,screenX=10,screenY=10");
}
function gowin(WO) {
    if (opener.closed) {
        NewWin=window.open("","sub_window");
        NewWin.location.href=WO;
                            } 
    else { opener.location.href=WO }
}
function init()
{
  var im = document.getElementsByTagName('img');

  for (var i = 0; i < im.length; i++){
    var t = im[i];
    if (t.className == "hover"){
      t.onmouseover = mouseOverProc;
      t.onmouseout = mouseOutProc;
    }
  }
}

window.onload = init;