function swapIcoA() {
	document.getElementById("txtPI").style.visibility = "visible";
}
function swapIcoB() {
	document.getElementById("txtPI").style.visibility = "hidden";
}
function swapIcoC() {
	document.getElementById("txtMS").style.visibility = "visible";
}
function swapIcoD() {
	document.getElementById("txtMS").style.visibility = "hidden";
}