var i=0;
var j=0;
var t=-1;
var timer1;
var xmlDoc;
var instances;
// -----------------------------------------------------------------------------
// Globals
// Major version of Flash required
var requiredMajorVersion = 9;
// Minor version of Flash required
var requiredMinorVersion = 0;
// Minor version of Flash required
var requiredRevision = 124;
// -----------------------------------------------------------------------------

function slide()
{



     if (navigator.appName == "Microsoft Internet Explorer")
     {
        presentation = document.getElementById("xmlid").childNodes[1];
        slides = presentation.childNodes[0];
        instances = slides.getAttribute("Instances");
        sli = slides.childNodes[t];
    
        lblHtml.innerHTML= sli.text;     
     }
     else
     {
        var xreq = new XMLHttpRequest();
//        xreq.open("GET", "http://localhost/MathsHeadVirtual/Introduction.aspx", false);
        xreq.open("GET", "Introduction.aspx", false);
        xreq.send(null);
                
        var presentation = xreq.responseXML;
        pres = presentation.getElementsByTagName("Presentation")[0];
        slides = pres.getElementsByTagName("Slides")[0];
        sli  = slides.getElementsByTagName("Slide")[t];
        instances = slides.getAttribute("Instances");
        lblHtml.innerHTML = sli.childNodes[1].nodeValue;
        
     }
     
     document.getElementById("Image1").src = "Graphics/IntroMathsImage" + j + ".jpg"
     i = i + 1;
     

}

function loadedXML()
{
}

function startSlides()
{

// Version check for the Flash Player that has the ability to start Player Product Install (6.0r65)
var hasProductInstall = DetectFlashVer(6, 0, 65);

// Version check based upon the values defined in globals
var hasRequestedVersion = DetectFlashVer(requiredMajorVersion, requiredMinorVersion, requiredRevision);
    if ( hasProductInstall && hasRequestedVersion ) {
        document.getElementById("altflash").style.display="none";
    }
   else
   {
        document.getElementById("flash").style.display="none";
        document.getElementById("altflash").innerHTML = '<br><br><br><br><br><br><br><br><br><br><br>&nbsp;<font color=#009900><b>This site works best with Flash, get the latest Adobe Flash Player here <a href=http://www.adobe.com/go/getflash/>Get Flash</a></font></b>' ;
   }

           document.getElementById("btnPrev").style.display = "none"
           j =1;
           t=0;
           slide();
     
}

function next()
{

     j = j + 1;
     
     if ( j > 5)
     {
        j =  1;
     }
     
     if ( t > -1)
    {
           document.getElementById("btnPrev").style.display = "block"
    }
     
     if ( t  < instances  )
     {
          t = t + 1;
    }

     if ( t  < instances - 1  )
     {
            document.getElementById("btnNext").style.display = "block"

     }
    else
    {
          document.getElementById("btnNext").style.display = "none"
    }


     slide();

     
}

function prev()
{
     j = j - 1;
     
     if ( j < 1)
     {
        j =  5;
     }
     
     if ( t  > -1)
     {
           t = t - 1;
     }
     

     if ( t  < instances)
    {
           document.getElementById("btnNext").style.display = "block"
    }
    else
    {
           document.getElementById("btnNext").style.display = "none"

    }
     
     if ( t == 0)
     {
           document.getElementById("btnPrev").style.display = "none"
     }
    else
    {
           document.getElementById("btnPrev").style.display = "block"

    }

     slide();
     
}