function changeLarge() {
	document.body.style.fontSize = '100%';
	var img_l = document.getElementById("sizebig");
	var img_m = document.getElementById("sizemedium");
	var img_s = document.getElementById("sizesmall");
	img_l.src = img_l.src.replace ("icon_big_w.gif" , "icon_big_bk.gif");
	img_m.src = img_m.src.replace ("icon_medium_bk.gif" , "icon_medium_w.gif");
	img_s.src = img_s.src.replace ("icon_small_bk.gif" , "icon_small_w.gif");
	//img_l.src = "img/icon_big_bk.gif";
	//img_m.src = "img/icon_medium_w.gif";
	//img_s.src = "img/icon_small_w.gif";
}

function changeMedium() {
	document.body.style.fontSize = '75%';
	var img_l = document.getElementById("sizebig");
	var img_m = document.getElementById("sizemedium");
	var img_s = document.getElementById("sizesmall");
	img_l.src = img_l.src.replace ("icon_big_bk.gif" , "icon_big_w.gif");
	img_m.src = img_m.src.replace ("icon_medium_w.gif" , "icon_medium_bk.gif");
	img_s.src = img_s.src.replace ("icon_small_bk.gif" , "icon_small_w.gif");
	/*img_l.src = "img/icon_big_w.gif";
	img_m.src = "img/icon_medium_bk.gif";
	img_s.src = "img/icon_small_w.gif";*/
}

function changeSmall() {
	document.body.style.fontSize = '60%';
	var img_l = document.getElementById("sizebig");
	var img_m = document.getElementById("sizemedium");
	var img_s = document.getElementById("sizesmall");
	img_l.src = img_l.src.replace ("icon_big_bk.gif" , "icon_big_w.gif");
	img_m.src = img_m.src.replace ("icon_medium_bk.gif" , "icon_medium_w.gif");
	img_s.src = img_s.src.replace ("icon_small_w.gif" , "icon_small_bk.gif");
	/*img_l.src = "img/icon_big_w.gif";
	img_m.src = "img/icon_medium_w.gif";
	img_s.src = "img/icon_small_bk.gif";*/
}