if (document.images) {

           image1on = new Image();
           image1on.src = "../pictures/pic_e/butt_h1.jpg";
           image2on = new Image();
           image2on.src = "../pictures/pic_e/butt_i1.jpg";
           image3on = new Image();
           image3on.src = "../pictures/pic_e/butt_c1.jpg";
           image4on = new Image();
           image4on.src = "../pictures/pic_e/butt_in1.jpg";
           image5on = new Image();
           image5on.src = "../pictures/pic_e/butt_m1.jpg";
           image6on = new Image();
           image6on.src = "../pictures/pic_e/butt_t1.jpg";
           image7on = new Image();
           image7on.src = "../pictures/pic_e/butt_d1.jpg";
           
	  
           image1off = new Image();
           image1off.src = "../pictures/pic_e/butt_h.jpg";
           image2off = new Image();
           image2off.src = "../pictures/pic_e/butt_i.jpg";
           image3off = new Image();
           image3off.src = "../pictures/pic_e/butt_c.jpg";
           image4off = new Image();
           image4off.src = "../pictures/pic_e/butt_in.jpg";
           image5off = new Image();
           image5off.src = "../pictures/pic_e/butt_m.jpg";
	   		image6off = new Image();
           image6off.src = "../pictures/pic_e/butt_t.jpg";
           image7off = new Image();
           image7off.src = "../pictures/pic_e/butt_d.jpg";
          	  
         }


function imgOn(imgName) {

          if (document.images) {
                 document[imgName].src = eval(imgName + "on.src");

          }
   }
function imgOff(imgName) {

          if (document.images) {
                 document[imgName].src = eval(imgName + "off.src");

          }
 }