browser = 0;if (document.images) {browser = 1}
	if (browser) {
		ppath = "images/"
		button_prefix_over= "on_"
		button_prefix_out = "off_"
		button_num    = 3
		cl = 0
		button_over     = new Array(button_num)
		button_out    = new Array(button_num)
		button_click    = new Array(button_num)
		for (i=1; i<=button_num;i++){
			setbutton_over = ppath + button_prefix_over + i + ".jpg"
			setbutton_out = ppath + button_prefix_out + i + ".jpg"


			button_over[i] = new Image()
			button_out[i] = new Image()

			button_over[i].src = setbutton_over
			button_out[i].src = setbutton_out

		}
	}
 
 	function b_on(n){
			
			if ((browser)&&(n==1)) document.but1.src = button_over[n].src
			if ((browser)&&(n==2)) document.but2.src = button_over[n].src
			if ((browser)&&(n==3)) document.but3.src = button_over[n].src
	}
        
	function b_off(n){
		
		if ((browser)&&(n==1)&&(cl!=1)) document.but1.src = button_out[n].src
		if ((browser)&&(n==2)&&(cl!=2)) document.but2.src = button_out[n].src
		if ((browser)&&(n==3)&&(cl!=3)) document.but3.src = button_out[n].src
	}