button_normal_1 = new Image();
button_normal_1.src = "./images/h1_0.png";     
button_highlight_1 = new Image();
button_highlight_1.src = "./images/h1_0_on.png"; 

button_normal_2 = new Image();
button_normal_2.src = "./images/h1_1.png";     
button_highlight_2 = new Image();
button_highlight_2.src = "./images/h1_1_on.png"; 

button_normal_3 = new Image();
button_normal_3.src = "./images/h1_2.png";     
button_highlight_3 = new Image();
button_highlight_3.src = "./images/h1_2_on.png"; 

button_normal_4 = new Image();
button_normal_4.src = "./images/h1_3.png";     
button_highlight_4 = new Image();
button_highlight_4.src = "./images/h1_3_on.png"; 

button_normal_5 = new Image();
button_normal_5.src = "./images/h1_4.png";     
button_highlight_5 = new Image();
button_highlight_5.src = "./images/h1_4_on.png"; 

button_normal_6 = new Image();
button_normal_6.src = "./images/h1_5.png";     
button_highlight_6 = new Image();
button_highlight_6.src = "./images/h1_5_on.png"; 

button_normal_7 = new Image();
button_normal_7.src = "./images/h1_6.png";     
button_highlight_7 = new Image();
button_highlight_7.src = "./images/h1_6_on.png"; 


/* usw. fuer alle weiteren zu benutzenden Grafiken */

function chImage(imgnr,imgobj) 
{
	window.document.images[imgnr].src = imgobj.src;
}