window.onload = function(){
	//set nav image
	var images_folder;
	images_folder = "/images/";
	
	if(document.getElementById('selected-nav')){
		switch(document.getElementById('selected-nav').innerHTML){
			case "skateparks":
				document.getElementById('skateparks-nav').src = images_folder+"/skatepark_active.gif";
			break;
			case "news":
				document.getElementById('news-nav').src = images_folder+"/news_active.gif";
			break;
			case "photos":
				document.getElementById('photos-nav').src = images_folder+"/photo_active.gif";
			break;
			case "winprizes":
				document.getElementById('prizes-nav').src = images_folder+"/winprizes_active.gif";
			break;
			case "producttest":
				document.getElementById('product-tests-nav').src = images_folder+"/producttests_active.gif";
			break;
			case "submitapark":
				document.getElementById('submit-park-nav').src = images_folder+"/submitapark_active.gif";
			break;
			case "contact":
				document.getElementById('contact-nav').src = images_folder+"/contact_active.gif";
			break;
			
		}
	}
}

function viewVideo(id_video){
	if(id_video < 0){
		document.getElementById('video_'+Math.abs(id_video)).style.display = 'none';	
	} else {
		document.getElementById('video_'+id_video).style.display = 'block';	
	}
}


function reloadAd(obj,thefile){
	xmlHttp = null;
	var xmlHttp; 
	try{ // Firefox, Opera 8.0+, Safari 
		xmlHttp=new XMLHttpRequest(); 
	}
	catch (e){ 
		try // Internet Explorer 
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); } 
		catch(e){ 
			try { 
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); } 
			catch (e){ 
				alert("Your browser does not support AJAX!"); 
				return false; 
			}
		}
	}
	
	
	xmlHttp.onreadystatechange=function(){ 
		if(xmlHttp.readyState==4){ 
			obj.innerHTML = xmlHttp.responseText;
		}
	}
	var theDate = new Date();
	
	xmlHttp.open("GET","http://skatepark.com/ad-rotation.php?v="+theDate.getTime()+"&the_ad_file="+thefile,true); 
	xmlHttp.send(null); 
}