var loc = ""+document.location;
var buttonIDs = new Array ("05_Summer_01.html", "05_Summer_02.html", "05_Summer_03.html", "05_Summer_04.html", "05_Summer_05.html", "05_Summer_06.html");
var index=3;
function UpdateMenu (){
	for (i=0; i<buttonIDs.length; i++){
		if (loc.indexOf(buttonIDs[i])>-1){
			index=i;
			
			break; 
		}
	}	
	if (index == buttonIDs.length-1)
		document.getElementById ("nextbutton").className = "hidden";
	if (index == 0)
		document.getElementById ("backbutton").innerHTML = "&nbsp;";

}
function GoForward(){
	if (index<buttonIDs.length){
		if (buttonIDs[index+1] != "share" && buttonIDs[index+1] != "credits")
			document.location = buttonIDs[index+1];
		else
			document.location = buttonIDs[index+1]+".cfm";
	}
}
function GoBack(){
	if (index>0){
		if (buttonIDs[index-1] != "share" && buttonIDs[index-1] != "credits")
			document.location = buttonIDs[index-1];
		else
			document.location = buttonIDs[index-1]+".cfm";
	}
}