if (document.images) {
      
      home_off = new Image();
      home_off.src = "buttons/home1.gif"  
      about_off = new Image();
      about_off.src = "buttons/aboutus1.gif"  
      events_off = new Image();
      events_off.src = "buttons/events1.gif"  
      links_off = new Image();
      links_off.src = "buttons/links1.gif"  
      contact_off = new Image();
      contact_off.src = "buttons/contactus1.gif"  

      home_on = new Image();
      home_on.src = "buttons/home2.gif"  
      about_on = new Image();
      about_on.src = "buttons/aboutus2.gif"  
      events_on = new Image();
      events_on.src = "buttons/events2.gif"  
      links_on = new Image();
      links_on.src = "buttons/links2.gif"  
	  contact_on = new Image();
      contact_on.src = "buttons/contactus2.gif"  
     

       
    


                 
}

function buttonOff(imgName) {
   document[imgName].src = eval(imgName + "_off.src");
}

function buttonOn(imgName) {
   document[imgName].src = eval(imgName + "_on.src");
}