function change_button(button_number,image)
	{
	if(imagecomplete == true)
	{
	if ((button_number != button))
		{

    	window.document.images[button_number].src = image.src;

		}
	}
    }

function button_select(button_number,image)
	{
	if(button != button_number)
		{
    	button = button_number;
		window.document.images[hilite].src = hilitescr.src;
		hilite = button_number;
		hilitescr = image;
		}
	}
function select_input(nr)
	{
	document.forms[0].elements[nr].focus();
	}
function init_button()
	{
	var counter = 0;
	button1a = new Image(); 
	button1a.src = "grafik/button/dat1.gif";
	button1b = new Image(); 
	button1b.src = "grafik/button/dat2.gif";
	
	button2a = new Image(); 
	button2a.src = "grafik/button/pla1.gif";
	button2b = new Image(); 
	button2b.src = "grafik/button/pla2.gif";
	
	button3a = new Image(); 
	button3a.src = "grafik/button/gal1.gif";
	button3b = new Image(); 
	button3b.src = "grafik/button/gal2.gif";
	
	button4a = new Image(); 
	button4a.src = "grafik/button/exi1.gif";
	button4b = new Image(); 
	button4b.src = "grafik/button/exi2.gif";
	
	
	button5a = new Image(); 
	button5a.src = "grafik/button/pre1.gif";
	button5b = new Image(); 
	button5b.src = "grafik/button/pre2.gif";
	
	button6a = new Image(); 
	button6a.src = "grafik/button/hom1.gif";
	button6b = new Image(); 
	button6b.src = "grafik/button/hom2.gif";
	
	home1 = new Image(); 
	home1.src = "grafik/button/pla1.gif";
	home2 = new Image(); 
	home2.src = "grafik/button/pla1.gif";
imagecomplete = true;
hilitescr = home1;
}


function open_window(url,name)
{
name = window.open(url,name,'toolbar=1,location=1,directories=0,status=1,menubar=1,scrollbars=1,resizable=1,width=520,height=350');
}