var d=document;
var flag=false;

if (d.images) {
	Button_Out = new Image();   Button_Out.src = "images/button_blank.gif";
	Button_Over = new Image();  Button_Over.src = "images/button_over.gif";
	
	flag=true;
}
function rollOver(imgName) {
	if (document.images && (flag == true)) {
		document.getElementById(imgName).style.backgroundImage = 'url(images/button_over.gif)';
	}
}
function rollOut(imgName) {
	if (document.images && (flag == true)) {
		document.getElementById(imgName).style.backgroundImage = 'url(images/button_blank.gif)';
	}
}

function reveal(id) {
	e=document.getElementById(id);
	if (e.style.display == 'none' || e.style.display =="") {
		e.style.display = 'block';
	} else {
		e.style.display = 'none';
	}
}