function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj + 'On = new Image()')
		eval(imgObj + 'On.src = imgSrc + "_on.gif"')
		eval(imgObj + 'Off = new Image()')
		eval(imgObj + 'Off.src = imgSrc + "_off.gif"')
	}
}

preload('a','images/nava');
preload('b','images/navb');
preload('c','images/navc');
preload('d','images/navd');
preload('e','images/nave');
preload('f','images/navf');
preload('g','images/navg');

function img_act(imgName) {
 		imgOn = eval(imgName + "On.src");
        document [imgName].src = imgOn;
}

function img_inact(imgName) {
        imgOff = eval(imgName + "Off.src");
        document [imgName].src = imgOff;
}

// Confirmation popup
function confirmation(message){
	if (!confirm(message)) {
		return false;  
	} else {
		return true;
	}
}


function openBioWin(id, rev) {
	// opens a new window with editor's biography
	var url = 'editorse4ff.html?op=bio&id='+id;
	if(rev) {
		url += '&rev=1';
	}
    window.open(url, 'Biography', 'height=400,width=300,screenX=150,screenY=100,left=150,top=100,scrollbars=yes');
}