image1= new Image();
 image1.src = "../buttons/b_01_01_ziel_a.gif";
 image1on = new Image();
 image1on.src = "../buttons/b_01_01_ziel_b.gif";
 image2= new Image();
 image2.src = "../buttons/b_01_02_trae_a.gif";
 image2on = new Image();
 image2on.src = "../buttons/b_01_02_trae_b.gif";
 image3= new Image();
 image3.src = "../buttons/b_01_03_part_a.gif";
 image3on = new Image();
 image3on.src = "../buttons/b_01_03_part_b.gif";
 image4= new Image();
 image4.src = "../buttons/b_01_04_demo_a.gif";
 image4on = new Image();
 image4on.src = "../buttons/b_01_04_demo_b.gif";
 image5= new Image();
 image5.src = "../buttons/b_01_05_down_a.gif";
 image5on = new Image();
 image5on.src = "../buttons/b_01_05_down_b.gif"; 
 image6= new Image();
 image6.src = "../buttons/b_01_06_pres_a.gif";
 image6on = new Image();
 image6on.src = "../buttons/b_01_06_pres_b.gif";
 image7= new Image();
 image7.src = "../buttons/b_01_07_kont_a.gif";
 image7on = new Image();
 image7on.src = "../buttons/b_01_07_kont_b.gif";
 image8= new Image();
 image8.src = "../buttons/b_01_08_impr_a.gif";
 image8on = new Image();
 image8on.src = "../buttons/b_01_08_impr_b.gif";



 function on(name)   {
         document[name].src = eval(name + "on.src");
 }
 function off(name)  {
         document[name].src = eval(name + ".src");
 }