function changeText(pic) {
	var rotateText = document.getElementById("hovertext");
	var bgpos = pic * -30;
	if(rotateText != null){
		rotateText.style.backgroundPosition = "0 " + bgpos + "px";
	}
}

function Glow(img) {
  if (window.glowing) {
		DeGlow();
	}
	img.src=img.src.replace('_off','_on'); 
	window.glowing=img;
}

function DeGlow(){ 
	if (!window.glowing) {
		return;
	}
	glowing.src=glowing.src.replace('_on','_off'); 
	glowing=null
}