function ButtonImage(img) {
	this.img = img;
	this.mouseoverImg = new Image();
	this.mouseoverImg.src = this.img.src.replace('.gif','_on.gif');
}

ButtonImage.prototype.setMouseOver = function() {
	var overImageSrc = this.mouseoverImg.src
	var outImageSrc  = this.img.src;
	this.img.onmouseover = function() { this.src = overImageSrc };
	this.img.onmouseout  = function() { this.src = outImageSrc };
}
/*
ButtonImage.prototype.setCurrentMouseOver = function() {
	var overImageSrc = this.mouseoverImg.src.replace('_on.gif','_cr_on.gif');
	var outImageSrc  = this.img.src;
	this.img.onmouseover = function() { this.src = overImageSrc };
	this.img.onmouseout  = function() { this.src = outImageSrc };
}
*/
ButtonImage.prototype.setDefaultOn = function() {
	this.img.src = this.img.src.replace('.gif','_cr.gif');
}

function setButtonImage(img,def) {
	var buttonImage = new ButtonImage(img);
	if (def == 1) {	
		buttonImage.setDefaultOn();
		//buttonImage.setCurrentMouseOver();
	}
	else {
		buttonImage.setMouseOver();
	}
	//return buttonImage;
}

Event.observe(
window,'load', function() {
	var buttons = document.getElementsByClassName('buttons');
	for (var i=0; i<buttons.length; i++) {
		if (window.defaultOn && defaultOn.indexOf('|'+buttons[i].id+'|')>=0) {
			setButtonImage(buttons[i],1);
		}
		else {
			setButtonImage(buttons[i]);
		}
	}
},
false
);