function change_img_button (id, root, mode) {
	var post = "";
	if (mode == 1)
		post = "_i";
	var el1 = document.getElementById(id+"_1");
	var el2 = document.getElementById(id+"_2");
	var el3 = document.getElementById(id+"_3");
	el1.src = root+"tab1"+post+".gif";
	el2.style.backgroundImage = "URL("+root+"tab2"+post+".gif)";
	el3.src = root+"tab3"+post+".gif";
}