var selectedBut = null;

function onBut(name) {
	var but = document.images[name];
	if (but == null) return;
	if (but != selectedBut) {
		but.src=but.src.replace(new RegExp('/off|/dis'),'/on');
	}
}
function hiBut(name) {
	var but = document.images[name];
	if (but == null) return;
	but.src=but.src.replace(new RegExp('/off|/dis'),'/hi');
}
function selBut(name) {
	var but = document.images[name];
	if (but == null) return;
	selectedBut = but;
	selectedBut.src=selectedBut.src.replace(new RegExp('/off|/dis'),'/hi');
}
function disBut(name) {
	var but = document.images[name];
	if (but == null) return;
	but.src=but.src.replace(new RegExp('/off|/on'),'/dis');
}
function offBut(name) {
	var but = document.images[name];
	if (but == null) return;
	if (but == selectedBut) {
		selBut(but);
	} else {
		but.src=but.src.replace(new RegExp('/on|/dis'),'/off');
	}
}
function preloadImages() {
	try {		
		var d=document;
		if(!d.MM_p) d.MM_p=new Array();
		var i,j=d.MM_p.length,a=preloadImages.arguments;
		for(i=0; i<a.length; i++) {d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}
	} catch (e) {}
}