if (document.images)
   {
     tab1on= new Image();	tab1on.src="images/buttons/home_over.gif";  
     tab2on= new Image();	tab2on.src="images/buttons/about_over.gif";
     tab3on= new Image();	tab3on.src="images/buttons/partners_over.gif";
     tab4on= new Image();	tab4on.src="images/buttons/contact_over.gif";
     tab5on= new Image();	tab5on.src="images/buttons/press_over.gif";
     tab6on= new Image();	tab6on.src="images/buttons/events_over.gif";
     tab7on= new Image();	tab7on.src="images/buttons/membership_over.gif";

     tab10on= new Image();	tab10on.src="images/homepage/step1_on.gif";
     tab11on= new Image();	tab11on.src="images/homepage/step2_on.gif";
     tab12on= new Image();	tab12on.src="images/homepage/step3_on.gif";

     tab1off= new Image();	tab1off.src="images/buttons/home_off.gif";
     tab2off= new Image();	tab2off.src="images/buttons/about_off.gif";
     tab3off= new Image();	tab3off.src="images/buttons/partners_off.gif";
     tab4off= new Image();	tab4off.src="images/buttons/contact_off.gif";
     tab5off= new Image();	tab5off.src="images/buttons/press_off.gif";
     tab6off= new Image();	tab6off.src="images/buttons/events_off.gif";
     tab7off= new Image();	tab7off.src="images/buttons/membership_off.gif";

     tab10off= new Image();	tab10off.src="images/homepage/step1_off.gif";
     tab11off= new Image();	tab11off.src="images/homepage/step2_off.gif";
     tab12off= new Image();	tab12off.src="images/homepage/step3_off.gif";
   }

function img_act(imgName,imgName2)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function img_inact(imgName,imgName2)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }