var current_navi=1;
var total_navi=5;
var userover=0;

function img_on(obj,navi_id)
{
	obj.src=obj.src.replace("_off","_on");	
}

function img_off(obj,navi_id)
{
	obj.src=obj.src.replace("_on","_off");
}

function onNavi_click(nav_id)
{
	current_navi=nav_id;	
	changeMainImg(nav_id);
	for(var i=1;i<=total_navi;i++)
	{
		img_off(document.getElementById("img_navi_"+i),i);
	}
	img_on(document.getElementById("img_navi_"+nav_id),nav_id);	
	userover=1;
}

function changeTab(nav_id)
{
	//alert(nav_id);
	for (var i=1;i<=total_navi;i++)
	{
		document.getElementById("img_navi_"+i).src=document.getElementById("img_navi_"+i).src.replace("_on","_off");		
	}
	
	document.getElementById("img_navi_"+nav_id).src=document.getElementById("img_navi_"+nav_id).src.replace("_off","_on");
	changeMainImg(nav_id);
	
}

function changeMainImg(navi_id)
{
	document.getElementById("main_img").src="images/prog"+navi_id+".jpg";
}

function swapIcon(){
	//alert(current_navi);
	if (userover==0)
	{
		if(current_navi>5)
			current_navi=1;		
		changeTab(current_navi);
		current_navi++;
	}
	
	setTimeout("swapIcon()", 4000);
}

function Querystring(qs) {
		this.params = new Object()
		this.get=Querystring_get
		
		if (qs == null)
			qs=location.search.substring(1,location.search.length)

		if (qs.length == 0) return

		qs = qs.replace(/\+/g, ' ')
		var args = qs.split('&')
		
		for (var i=0;i<args.length;i++) {
			var value;
			var pair = args[i].split('=')
			var name = unescape(pair[0])

			if (pair.length == 2)
				value = unescape(pair[1])
			else
				value = name
			
			this.params[name] = value
		}
	}
	
	function Querystring_get(key, default_) {
		if (default_ == null) default_ = null;
		
		var value=this.params[key]
		if (value==null) value=default_;
		
		return value
	}
	
function changeTabprog(tab_id)
{
	for(var i=1;i<=5;i++)
	{
		if(i==tab_id)
		{
			img_on(document.getElementById("img_prog_"+i),i)
			document.getElementById("tab_"+i).style.display="inline";
		}
		else
		{
			img_off(document.getElementById("img_prog_"+i),i)
			document.getElementById("tab_"+i).style.display="none";
		}
	}
}