// *** preload all nav images
function preloadNav() {
	var nav = new Array();
	
	nav[0]="../images/nav_archive_on.gif";
	nav[1]="../images/nav_about_the_journal_on.gif";
	nav[2]="../images/nav_cont_guide_on.gif";
	nav[3]="../images/nav_contact_details_on.gif";
	nav[4]="../images/nav_editorial_policy_on.gif";
	nav[5]="../images/nav_registration_on.gif";
	nav[6]="../images/nav_this_issue_on.gif";

	var i;
	for(i=0; i<nav.length; i++) {
		var img = new Image();
	    img.src = nav[i];
	}
}

preloadNav();

function imgRO(imgObj, onState) {
	var tempSrc;
	if(onState) {
		tempSrc = imgObj.src.replace(".gif", "_on.gif");
		imgObj.src = tempSrc;
	} else {
		tempSrc = imgObj.src.replace("_on.gif", ".gif");
		imgObj.src = tempSrc;
	}
}