if (document.images) {
  var navi_1 = new Image()
  navi_1.src = "http://www.jobjob.co.th/template/images/en/mnu_home.gif";
  var navi_1_2 = new Image()
  navi_1_2.src = "http://www.jobjob.co.th/template/images/en/mnu_home_h.gif";

  var navi_2 = new Image()
  navi_2.src = "http://www.jobjob.co.th/template/images/en/mnu_about_us.gif";
  var navi_2_2 = new Image()
  navi_2_2.src = "http://www.jobjob.co.th/template/images/en/mnu_about_us_h.gif";

  var navi_3 = new Image()
  navi_3.src = "http://www.jobjob.co.th/template/images/en/mnu_quick_guide.gif";
  var navi_3_2 = new Image()
  navi_3_2.src = "http://www.jobjob.co.th/template/images/en/mnu_quick_guide_h.gif";

  var navi_4 = new Image()
  navi_4.src = "http://www.jobjob.co.th/template/images/en/mnu_job_search.gif";
  var navi_4_2 = new Image()
  navi_4_2.src = "http://www.jobjob.co.th/template/images/en/mnu_job_search_h.gif";

  var navi_5 = new Image()
  navi_5.src = "http://www.jobjob.co.th/template/images/en/mnu_post_resume.gif";
  var navi_5_2 = new Image()
  navi_5_2.src = "http://www.jobjob.co.th/template/images/en/mnu_post_resume_h.gif";

  var navi_6 = new Image()
  navi_6.src = "http://www.jobjob.co.th/template/images/en/mnu_caree_tips.gif";
  var navi_6_2 = new Image()
  navi_6_2.src = "http://www.jobjob.co.th/template/images/en/mnu_caree_tips_h.gif";

  var navi_7 = new Image()
  navi_7.src = "http://www.jobjob.co.th/template/images/en/mnu_news.gif";
  var navi_7_2 = new Image()
  navi_7_2.src = "http://www.jobjob.co.th/template/images/en/mnu_news_h.gif";

  var navi_8 = new Image()
  navi_8.src = "http://www.jobjob.co.th/template/images/en/mnu_career_blog.gif";
  var navi_8_2 = new Image()
  navi_8_2.src = "http://www.jobjob.co.th/template/images/en/mnu_career_blog_h.gif";

  var navi_9 = new Image()
  navi_9.src = "http://www.jobjob.co.th/template/images/en/mnu_contact_us.gif";
  var navi_9_2 = new Image()
  navi_9_2.src = "http://www.jobjob.co.th/template/images/en/mnu_contact_us_h.gif";
}

function act(imgName) {
  if (document.images)    
	document.getElementById(imgName).src = eval(imgName + '_2.src'); 
}

function inact(imgName) {
  if (document.images)
	document.getElementById(imgName).src = eval(imgName + '.src');	
}