d=document;
p="./";

function swap(imgName,imgSrc) {
	d.images[imgName].src=GetPath(d.images[imgName].src)+imgSrc;
}
function swapex(obj,imgSrc) {
	if (obj!=null&&obj.src!=null) obj.src=GetPath(obj.src)+imgSrc;
}
function GetPath(str) {
	var ret="";
	var aret=str.split("/");
	for (var i=0;i<aret.length-1;i++){
		ret+=aret[i]+'/';
	}
	return ret;
}


function getQueryVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  }
}

function chkObj(obj) {
    if (document.getElementById(obj) != null) {
        return true;
    } else {
       return false;
    }
}

function setNav(currentPage) {
	switch(currentPage) {
	case "Welcome" : 
		if (chkObj("navListWelcome")) {
			document.getElementById('navListWelcome').innerHTML="<img id=\"NavWelcome\" src=\"/images/layout/nav_Welcome_2.png\" alt=\"Welcome\" />";
		}
	break;
	case "What" : 
		if (chkObj("navListHowClearPlayWorks")) {
			document.getElementById('navListHowClearPlayWorks').innerHTML="<img id=\"NavWhat\" src=\"/images/layout/nav_What_2.png\" alt=\"What is ClearPlay\" />";
		}
	break;
	case "AvailableMovies" : 
		if (chkObj("navListAvailableMovies")) {
			document.getElementById('navListAvailableMovies').innerHTML="<img id=\"NavAvailableMovies\" src=\"/images/layout/nav_AvailableMovies_2.png\" alt=\"Available Movies\" />";
		}
	break;
	case "GetCP" : 
		if (chkObj("navListGetCP")) {
			document.getElementById('navListGetCP').innerHTML="<img id=\"NavGetCP\" src=\"/images/layout/nav_GetCP_2.png\" alt=\"Get ClearPlay Now!\" />";
		}
	break;
	case "Download" : 
		if (chkObj("navListDownload")) {
			document.getElementById('navListDownload').innerHTML="<img id=\"NavDownload\" src=\"/images/layout/nav_DownloadFilters_2.png\" alt=\"Download Filters\" />";
		}
	break;
	case "Movies" : 
		if (chkObj("navListMovies")) {
			document.getElementById('navListMovies').innerHTML="<img id=\"NavMovies\" src=\"/images/layout/nav_Movies_2.png\" alt=\"Movies\" />";
		}
	break;
	case "Purchase" : 
		if (chkObj("navListPurchase")) {
			document.getElementById('navListPurchase').innerHTML="<img id=\"NavPurchase\" src=\"/images/layout/nav_Purchase_2.png\" alt=\"Purchase / Upgrade\" />";
		}
	break;
	default :
		null();
	}
}