function updatePButton(buttonNo, catagory) {
	    buttonOn = buttonNo
		eval("document.getElementById('pbutton"+catagory+"').src=pbuttonOff"+catagory+".src");
		eval("document.getElementById('pbutton"+buttonOn+"').src=pbuttonOn"+buttonOn+".src");
}

function deactivatePButton(buttonNo, catagory) {
	eval("document.getElementById('pbutton"+catagory+"').src=pbuttonOn"+catagory+".src");
	if (catagory == buttonOn) {
		eval("document.getElementById('pbutton"+buttonOn+"').src=pbuttonOn"+buttonOn+".src");
	} else {
		eval("document.getElementById('pbutton"+buttonOn+"').src=pbuttonOff"+buttonOn+".src");
	}
}