var curPic = false;
var curYearDiv = false;
var curDescDiv = false;
var lightBorder = "white";
var darkBorder = "#387ABC";


function TimeLine_Swap(obj, objToShowID){
	changeImgSrc(curPic, curPic.src.substring(0, (curPic.src.length - 6)) + ".gif");
	changeImgSrc(obj, obj.src.substring(0, (obj.src.length - 4)) + "on.gif");
	
	hideObject(curYearDiv);
	showObject(document.getElementById(objToShowID));
}

function TimeLine_Restore(obj, objToShowID){
	changeImgSrc(obj, obj.src.substring(0, (obj.src.length - 6)) + ".gif");
	changeImgSrc(curPic, curPic.src.substring(0, (curPic.src.length - 4)) + "on.gif");
		
	hideObject(document.getElementById(objToShowID));
	showObject(curYearDiv);
}

function TimeLine_Lock(obj, objToShowID){
	curPic = obj;
	
	hideObject(curYearDiv);
	curYearDiv = document.getElementById(objToShowID);
	showObject(curYearDiv);
	

}

function show_extra_block(objToShowID){
	hideObject(curDescDiv);
	curDescDiv = document.getElementById(objToShowID);
	showObject(curDescDiv);
}

function changeBorderColor(obj, color){
	if(obj)
		obj.style.borderColor = color;
}

function changeImgSrc(obj, url){
	if(obj)
		obj.src = url;
}

function showObject(obj){
	if(obj)
		obj.style.display = "block";
}

function hideObject(obj){
	if(obj)
		obj.style.display = "none";
}