if (document.images)
   {
     pic1on= new Image(114,28);
     pic1on.src="images/home_1x1.gif";  
     pic1off= new Image(114,28);
     pic1off.src="images/homeoff_1x1.gif";

     pic2on= new Image(238 ,28);
     pic2on.src="images/home_1x2.gif";  
     pic2off= new Image(238,28);
     pic2off.src="images/homeoff_1x2.gif";
     
     pic3on= new Image(155,28);
     pic3on.src="images/home_1x3.gif";  
     pic3off= new Image(155,28);
     pic3off.src="images/homeoff_1x3.gif";
     
     pic4on= new Image(244,28);
     pic4on.src="images/home_1x4.gif";  
     pic4off= new Image(244,28);
     pic4off.src="images/homeoff_1x4.gif";

   }