function toggleNavImage(imageName,v,imagePath,b){
	var imageUp;
	var divID	=	imageName.substring(0,imageName.length-3);
	if (document.images[imageName].src.indexOf("on")>0)		imageUp	=	false;
	else													imageUp	=	true;

	if(!imageUp)	{
		MM_swapImage(imageName,v,imagePath,b);
		$("#"+divID).css({backgroundColor:"#FFFFFF"});
	}else{
		MM_swapImage(imageName,v,imagePath.replace(/off/,"on"),b);
		$("#"+divID).css({backgroundColor:"#000000"});
	}
}function closePastIssuesNav(){
	$("#pastIssuesContainer").css({display:"none",visibility:"hidden"});
}function showPastIssuesNav(){
	$("#pastIssuesContainer").css({display:"inline",visibility:"visible"});
}

//preload images
var img1	=	new Image();
img1.src	=	"/pastIssuesNav/images/fall.09.on.jpg";

var img2	=	new Image();
img2.src	=	"/pastIssuesNav/images/spring.09.on.jpg";

var img3	=	new Image();
img3.src	=	"/pastIssuesNav/images/fall.10.on.jpg";

var img4	=	new Image();
img4.src	=	"/pastIssuesNav/images/spring.10.on.jpg";

var img5	=	new Image();
img5.src	=	"/pastIssuesNav/images/fall.11.on.jpg";