//PRELOAD IMMAGINI
	btn1_off = new Image();
	btn1_off.src = "img_all/btn_01_off.gif";
	btn1_on = new Image();
	btn1_on.src = "img_all/btn_01_on.gif";

	btn2_off = new Image();
	btn2_off.src = "img_all/btn_02_off.gif";
	btn2_on = new Image();
	btn2_on.src = "img_all/btn_02_on.gif";
	
	btn3_off = new Image();
	btn3_off.src ="img_all/btn_03_off.gif";
	btn3_on = new Image();
	btn3_on.src = "img_all/btn_03_on.gif";
	
	btn4_off = new Image();
	btn4_off.src ="img_all/btn_04_off.gif";
	btn4_on = new Image();
	btn4_on.src = "img_all/btn_04_on.gif";
	
	btn5_off = new Image();
	btn5_off.src ="img_all/btn_05_off.gif";
	btn5_on = new Image();
	btn5_on.src = "img_all/btn_05_on.gif";

	btn6_off = new Image();
	btn6_off.src ="img_all/btn_06_off.gif";
	btn6_on = new Image();
	btn6_on.src = "img_all/btn_06_on.gif";

	btn7_off = new Image();
	btn7_off.src ="img_all/btn_07_off.gif";
	btn7_on = new Image();
	btn7_on.src = "img_all/btn_07_on.gif";

	btn8_off = new Image();
	btn8_off.src ="img_all/btn_08_off.gif";
	btn8_on = new Image();
	btn8_on.src = "img_all/btn_08_on.gif";

	btn9_off = new Image();
	btn9_off.src ="img_all/btn_09_off.gif";
	btn9_on = new Image();
	btn9_on.src = "img_all/btn_09_on.gif";

	btn10_off = new Image();
	btn10_off.src ="img_all/btn_10_off.gif";
	btn10_on = new Image();
	btn10_on.src = "img_all/btn_10_on.gif";


	
function imgOn(imgName)
{
	document.images[imgName].src=eval(imgName + "_on.src")
}


function imgOff(imgName)
{
	document.images[imgName].src=eval(imgName + "_off.src")
}