var butt_on, butt_done;
var btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn10;
var btn1on, btn2on, btn3on, btn4on, btn5on, btn6on, btn7on, btn8on, btn9on, btn10on;

butt_done=false;

//swaps images 

function changeImages() {
	if ((changeImages.arguments[0] != "thisbtn" + butt_on)){
	for (var i=0; i<changeImages.arguments.length; i+=2) {
		document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
	}

  }
}


btn1 = new Image();
btn1.src = "images/nav/img_nav1.jpg";
btn1on = new Image();
btn1on.src = "images/nav/img_nav1_on.jpg";

btn2 = new Image();
btn2.src = "images/nav/img_nav2.jpg";
btn2on = new Image();
btn2on.src = "images/nav/img_nav2_on.jpg";

btn3 = new Image();
btn3.src = "images/nav/img_nav3.jpg";
btn3on = new Image();
btn3on.src = "images/nav/img_nav3_on.jpg";

btn4 = new Image();
btn4.src = "images/nav/img_nav4.jpg";
btn4on = new Image();
btn4on.src = "images/nav/img_nav4_on.jpg";

btn5 = new Image();
btn5.src = "images/nav/img_nav5.jpg";
btn5on = new Image();
btn5on.src = "images/nav/img_nav5_on.jpg";

btn6 = new Image();
btn6.src = "images/nav/img_nav6.jpg";
btn6on = new Image();
btn6on.src = "images/nav/img_nav6_on.jpg";

btn7 = new Image();
btn7.src = "images/nav/img_nav7.jpg";
btn7on = new Image();
btn7on.src = "images/nav/img_nav7_on.jpg";

btn8 = new Image();
btn8.src = "images/nav/img_nav8.jpg";
btn8on = new Image();
btn8on.src = "images/nav/img_nav8_on.jpg";

btn9 = new Image();
btn9.src = "images/nav/img_nav9.jpg";
btn9on = new Image();
btn9on.src = "images/nav/img_nav9_on.jpg";

btn10 = new Image();
btn10.src = "images/nav/img_nav10.jpg";
btn10on = new Image();
btn10on.src = "images/nav/img_nav10_on.jpg";


function turnon(btnno) {
	changeImages("thisbtn" + btnno, "btn" + btnno + "on");
}