function nextPage()
{   if(pid<7){
     
    for(var i=1; i<7; i++)
    {
        document.getElementById("contentP"+i).style.display="none";
        
    }
    pid=pid+1;
    
    document.getElementById("contentP"+pid).style.display="block";
    document.getElementById("imgleft").src="images/pics/leftP"+pid+".jpg";
    if(pid==1)
    {
        document.getElementById("headerimg").src="images/pics/65.jpg";
        document.getElementById("nav").style.top="780px";
    }
    else if(pid==6)
    {
       if(started==0)
       {calculateTime();
       started=1;}
       document.getElementById("headerimg").src="images/pics/headerP"+pid+".jpg";
       document.getElementById("pageForward").style.display="none";
       document.getElementById("pageBack").style.display="block";
       document.getElementById("nav").style.top="780px";
    }
    else if(pid==3|pid==5)
    {
        document.getElementById("headerimg").src="images/pics/headerP"+pid+".jpg";
        document.getElementById("pageBack").style.display="block";
        document.getElementById("pageForward").style.display="block";
        document.getElementById("nav").style.top="994px";
    }
    else
    {
        document.getElementById("headerimg").src="images/pics/headerP"+pid+".jpg";
        document.getElementById("pageBack").style.display="block";
        document.getElementById("pageForward").style.display="block";
        document.getElementById("nav").style.top="780px"; 
    }
    }
}

function prevPage()
{   if(pid>1)
{
    for(var j=1; j<7; j++)
    {
        document.getElementById("contentP"+j).style.display="none";
    }
    pid=pid-1;

    document.getElementById("contentP"+pid).style.display="block";
    document.getElementById("imgleft").src="images/pics/leftP"+pid+".jpg";
    if(pid==1)
    {
        document.getElementById("headerimg").src="images/pics/65.jpg";
        document.getElementById("pageBack").style.display="none";
        document.getElementById("pageForward").style.display="block";
        document.getElementById("nav").style.top="780px";
    }
    else if(pid==6)
    {
       calculateTime();
       document.getElementById("headerimg").src="images/pics/headerP"+pid+".jpg";
       document.getElementById("pageBack").style.display="block";
       document.getElementById("pageForward").style.display="block";
       document.getElementById("nav").style.top="780px";
    }
    else if(pid==3|pid==5)
    {
        document.getElementById("headerimg").src="images/pics/headerP"+pid+".jpg";
        document.getElementById("pageBack").style.display="block";
        document.getElementById("pageForward").style.display="block";
        document.getElementById("nav").style.top="994px";
    }
    else
    {
        document.getElementById("headerimg").src="images/pics/headerP"+pid+".jpg";
        document.getElementById("pageBack").style.display="block";
        document.getElementById("pageForward").style.display="block";
        document.getElementById("nav").style.top="780px";
    }
    }
}

function restart()
{  
for(var i=1; i<7; i++)
    {
        document.getElementById("contentP"+i).style.display="none";
    }
    document.getElementById("contentP1").style.display="block";
    document.getElementById("imgleft").src="images/pics/leftP1.jpg";
    document.getElementById("headerimg").src="images/pics/65.jpg";
    document.getElementById("pageBack").style.display="none";
    document.getElementById("pageForward").style.display="block";
    document.getElementById("nav").style.top="780px";
    pid=1;
    
}