envLoaded = false;

b_1_on = new Image(25,211);
b_1_on.src = "gfx/b_about_on.gif";
b_1_off = new Image(25,211);
b_1_off.src = "gfx/b_about_off.gif";

b_2_on = new Image(25,211);
b_2_on.src = "gfx/b_projectExp_on.gif";
b_2_off = new Image(25,211);
b_2_off.src = "gfx/b_projectExp_off.gif";

b_3_on = new Image(25,211);
b_3_on.src = "gfx/b_staff_on.gif";
b_3_off = new Image(25,211);
b_3_off.src = "gfx/b_staff_off.gif";

b_4_on = new Image(25,211);
b_4_on.src = "gfx/b_download_on.gif";
b_4_off = new Image(25,211);
b_4_off.src = "gfx/b_download_off.gif";

envLoaded = true;
//alert("loaded!");

function switchPic(bName,whatAction){
	if (envLoaded) {
//		alert("switch pic initiated, envLoaded=" + envLoaded + " , bName=" + bName + ", whatAction=" + whatAction);
		buttonName = bName + "_" + whatAction;
		document.images[bName].src = eval(buttonName + ".src");
	} else {
//		alert("not loaded. envLoaded="+envLoaded);
	}
}