//Site-wide functions

sfHover = function() {
	var sfEls = document.getElementById("topNav").getElementsByTagName("li");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

function start_slideshow(start_frame, end_frame, delay) {
    setTimeout(switch_slides(start_frame,start_frame,end_frame, delay), delay);
}
                        
function switch_slides(frame, start_frame, end_frame, delay) {
    return (function() {
        Effect.Fade('slideshow' + frame);
        if (frame == end_frame) { frame = start_frame; } else { frame = frame + 1; }
        setTimeout("Effect.Appear('slideshow" + frame + "');", 850);
        setTimeout(switch_slides(frame, start_frame, end_frame, delay), delay + 850);
    })
}

var curmenu = "";

function showMenu(id) {
	//first close open menu
	if (curmenu != '' && curmenu != id) {
		Effect.toggle("docMenu"+curmenu, "blind", {duration: 0.5});
	}
	
	//now open clicked menu
    Effect.toggle("docMenu"+id, "blind", {duration: 0.5});
	
	//now set variable to remember which is open
	if (curmenu != id) {
		curmenu = id
	}else{
		//if the ids are the same, means they've clicked currently open one so reset var
		curmenu = ""
	}
}

function checkChangelog() {
	if (document.frmEditContent.changelog.value == '') {
		alert("Please ensure you have entered your name in the Changed By box.");
		return false;
	} else {
	return true;
	}
}